---
_id: '10920'
abstract:
- lang: eng
  text: The spin-orbit interaction permits to control the state of a spin qubit via
    electric fields. For holes it is particularly strong, allowing for fast all electrical
    qubit manipulation, and yet an in-depth understanding of this interaction in hole
    systems is missing. Here we investigate, experimentally and theoretically, the
    effect of the cubic Rashba spin-orbit interaction on the mixing of the spin states
    by studying singlet-triplet oscillations in a planar Ge hole double quantum dot.
    Landau-Zener sweeps at different magnetic field directions allow us to disentangle
    the effects of the spin-orbit induced spin-flip term from those caused by strongly
    site-dependent and anisotropic quantum dot g tensors. Our work, therefore, provides
    new insights into the hole spin-orbit interaction, necessary for optimizing future
    qubit experiments.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "This research was supported by the Scientific Service Units of ISTA
  through resources provided by the MIBA Machine Shop and the nanofabrication facility.
  This project has received funding from the European Union’s Horizon 2020 research
  and innovation program under the Marie\r\nSkłodowska-Curie Grant Agreement No. 844511,
  No. 75441, and by the FWF-P 30207, I05060, and M3032-N projects. A. B. acknowledges
  support from the EU Horizon-2020 FET project microSPIRE, ID: 766955. P.M. M. and
  G. B. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG—German Research
  Foundation) under Project No. 450396347. This work was supported by the Royal Society
  (URF\\R1\\191150) and the European Research Council (Grant Agreement No. 948932),
  N. A. acknowledges the use of the University of Oxford Advanced Research Computing
  (ARC) facility."
article_number: '126803'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Daniel
  full_name: Jirovec, Daniel
  id: 4C473F58-F248-11E8-B48F-1D18A9856A87
  last_name: Jirovec
  orcid: 0000-0002-7197-4801
- first_name: Philipp M.
  full_name: Mutter, Philipp M.
  last_name: Mutter
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Alessandro
  full_name: Crippa, Alessandro
  id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
  last_name: Crippa
  orcid: 0000-0002-2968-611X
- first_name: Marek
  full_name: Rychetsky, Marek
  last_name: Rychetsky
- first_name: David L.
  full_name: Craig, David L.
  last_name: Craig
- first_name: Josip
  full_name: Kukucka, Josip
  id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
  last_name: Kukucka
- first_name: Frederico
  full_name: Martins, Frederico
  id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E
  last_name: Martins
  orcid: 0000-0003-2668-2401
- first_name: Andrea
  full_name: Ballabio, Andrea
  last_name: Ballabio
- first_name: Natalia
  full_name: Ares, Natalia
  last_name: Ares
- first_name: Daniel
  full_name: Chrastina, Daniel
  last_name: Chrastina
- first_name: Giovanni
  full_name: Isella, Giovanni
  last_name: Isella
- first_name: 'Guido '
  full_name: 'Burkard, Guido '
  last_name: Burkard
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
citation:
  ama: Jirovec D, Mutter PM, Hofmann AC, et al. Dynamics of hole singlet-triplet qubits
    with large g-factor differences. <i>Physical Review Letters</i>. 2022;128(12).
    doi:<a href="https://doi.org/10.1103/PhysRevLett.128.126803">10.1103/PhysRevLett.128.126803</a>
  apa: Jirovec, D., Mutter, P. M., Hofmann, A. C., Crippa, A., Rychetsky, M., Craig,
    D. L., … Katsaros, G. (2022). Dynamics of hole singlet-triplet qubits with large
    g-factor differences. <i>Physical Review Letters</i>. American Physical Society.
    <a href="https://doi.org/10.1103/PhysRevLett.128.126803">https://doi.org/10.1103/PhysRevLett.128.126803</a>
  chicago: Jirovec, Daniel, Philipp M. Mutter, Andrea C Hofmann, Alessandro Crippa,
    Marek Rychetsky, David L. Craig, Josip Kukucka, et al. “Dynamics of Hole Singlet-Triplet
    Qubits with Large g-Factor Differences.” <i>Physical Review Letters</i>. American
    Physical Society, 2022. <a href="https://doi.org/10.1103/PhysRevLett.128.126803">https://doi.org/10.1103/PhysRevLett.128.126803</a>.
  ieee: D. Jirovec <i>et al.</i>, “Dynamics of hole singlet-triplet qubits with large
    g-factor differences,” <i>Physical Review Letters</i>, vol. 128, no. 12. American
    Physical Society, 2022.
  ista: Jirovec D, Mutter PM, Hofmann AC, Crippa A, Rychetsky M, Craig DL, Kukucka
    J, Martins F, Ballabio A, Ares N, Chrastina D, Isella G, Burkard G, Katsaros G.
    2022. Dynamics of hole singlet-triplet qubits with large g-factor differences.
    Physical Review Letters. 128(12), 126803.
  mla: Jirovec, Daniel, et al. “Dynamics of Hole Singlet-Triplet Qubits with Large
    g-Factor Differences.” <i>Physical Review Letters</i>, vol. 128, no. 12, 126803,
    American Physical Society, 2022, doi:<a href="https://doi.org/10.1103/PhysRevLett.128.126803">10.1103/PhysRevLett.128.126803</a>.
  short: D. Jirovec, P.M. Mutter, A.C. Hofmann, A. Crippa, M. Rychetsky, D.L. Craig,
    J. Kukucka, F. Martins, A. Ballabio, N. Ares, D. Chrastina, G. Isella, G. Burkard,
    G. Katsaros, Physical Review Letters 128 (2022).
date_created: 2022-03-24T15:51:11Z
date_published: 2022-03-24T00:00:00Z
date_updated: 2023-08-03T06:14:58Z
day: '24'
ddc:
- '530'
department:
- _id: GradSch
- _id: GeKa
doi: 10.1103/PhysRevLett.128.126803
ec_funded: 1
external_id:
  arxiv:
  - '2111.05130'
  isi:
  - '000786542500004'
file:
- access_level: open_access
  checksum: 6e66ad548d18db9c131f304acbd5a1f4
  content_type: application/pdf
  creator: dernst
  date_created: 2022-03-28T06:53:39Z
  date_updated: 2022-03-28T06:53:39Z
  file_id: '10928'
  file_name: 2022_PhysRevLetters_Jirovec.pdf
  file_size: 1266515
  relation: main_file
  success: 1
file_date_updated: 2022-03-28T06:53:39Z
has_accepted_license: '1'
intvolume: '       128'
isi: 1
issue: '12'
language:
- iso: eng
month: '03'
oa: 1
oa_version: Published Version
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P30207
  name: Hole spin orbit qubits in Ge quantum wells
- _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1
  grant_number: I05060
  name: High impedance circuit quantum electrodynamics with hole spins
- _id: c08c05c4-5a5b-11eb-8a69-dc6ce49d7973
  grant_number: M03032
  name: Long-range spin exchange for 2D qubits architectures
publication: Physical Review Letters
publication_identifier:
  eissn:
  - 1079-7114
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Dynamics of hole singlet-triplet qubits with large g-factor differences
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 128
year: '2022'
...
---
_id: '12118'
abstract:
- lang: eng
  text: Hybrid semiconductor–superconductor devices hold great promise for realizing
    topological quantum computing with Majorana zero modes1,2,3,4,5. However, multiple
    claims of Majorana detection, based on either tunnelling6,7,8,9,10 or Coulomb
    blockade (CB) spectroscopy11,12, remain disputed. Here we devise an experimental
    protocol that allows us to perform both types of measurement on the same hybrid
    island by adjusting its charging energy via tunable junctions to the normal leads.
    This method reduces ambiguities of Majorana detections by checking the consistency
    between CB spectroscopy and zero-bias peaks in non-blockaded transport. Specifically,
    we observe junction-dependent, even–odd modulated, single-electron CB peaks in
    InAs/Al hybrid nanowires without concomitant low-bias peaks in tunnelling spectroscopy.
    We provide a theoretical interpretation of the experimental observations in terms
    of low-energy, longitudinally confined island states rather than overlapping Majorana
    modes. Our results highlight the importance of combined measurements on the same
    device for the identification of topological Majorana zero modes.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: We thank P. Krogstrup for providing us with the NW materials. We
  thank A. Higginbotham, E. J. H. Lee, C. Marcus and S. Vaitiekėnas for helpful discussions
  and G. Steffensen for his input on the diffusive Little-Parks theory. This research
  was supported by the Scientific Service Units of ISTA through resources provided
  by the MIBA Machine Shop and the nanofabrication facility; the NOMIS Foundation;
  the CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies (PTI-QTEP+).
  A.H. acknowledges support from H2020-MSCA-IF-2018/844511. ICN2 also acknowledges
  funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo
  Ochoa Program from Spanish MINECO (Grant no. SEV-2017-0706) and is funded by the
  CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed
  in the framework of Universitat Autònoma de Barcelona Materials Science PhD programme.
  Authors acknowledge the use of instrumentation as well as the technical advice provided
  by the National Facility ELECMI ICTS, node ‘Laboratorio de Microscopías Avanzadas’
  at University of Zaragoza. This project has received funding from the European Union’s
  Horizon 2020 research and innovation programme under grant agreement no. 823717-ESTEEM3.
  This study was supported by MCIN with funding from European Union NextGenerationEU
  (PRTR-C17.I1) and Generalitat de Catalunya. This research is part of the CSIC programme
  for the Spanish Recovery, Transformation and Resilience Plan funded by the Recovery
  and Resilience Facility of the European Union, established by the Regulation (EU)
  2020/2094. We thank support from Grant PGC2018-097018-BI00, project FlagERA TOPOGRAPH
  (PCI2018-093026) and project NANOGEN (PID2020-116093RB-C43), funded by MCIN/AEI/10.13039/501100011033/
  and by ‘ERDF A way of making Europe’, by the European Union. M. Botifoll acknowledges
  support from SUR Generalitat de Catalunya and the EU Social Fund (project ref. 2020
  FI 00103).
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Marco
  full_name: Valentini, Marco
  id: C0BB2FAC-D767-11E9-B658-BC13E6697425
  last_name: Valentini
- first_name: Maksim
  full_name: Borovkov, Maksim
  id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087
  last_name: Borovkov
- first_name: Elsa
  full_name: Prada, Elsa
  last_name: Prada
- first_name: Sara
  full_name: Martí-Sánchez, Sara
  last_name: Martí-Sánchez
- first_name: Marc
  full_name: Botifoll, Marc
  last_name: Botifoll
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Jordi
  full_name: Arbiol, Jordi
  last_name: Arbiol
- first_name: Ramón
  full_name: Aguado, Ramón
  last_name: Aguado
- first_name: Pablo
  full_name: San-Jose, Pablo
  last_name: San-Jose
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Valentini M, Borovkov M, Prada E, et al. Majorana-like Coulomb spectroscopy
    in the absence of zero-bias peaks. <i>Nature</i>. 2022;612(7940):442-447. doi:<a
    href="https://doi.org/10.1038/s41586-022-05382-w">10.1038/s41586-022-05382-w</a>
  apa: Valentini, M., Borovkov, M., Prada, E., Martí-Sánchez, S., Botifoll, M., Hofmann,
    A. C., … Katsaros, G. (2022). Majorana-like Coulomb spectroscopy in the absence
    of zero-bias peaks. <i>Nature</i>. Springer Nature. <a href="https://doi.org/10.1038/s41586-022-05382-w">https://doi.org/10.1038/s41586-022-05382-w</a>
  chicago: Valentini, Marco, Maksim Borovkov, Elsa Prada, Sara Martí-Sánchez, Marc
    Botifoll, Andrea C Hofmann, Jordi Arbiol, Ramón Aguado, Pablo San-Jose, and Georgios
    Katsaros. “Majorana-like Coulomb Spectroscopy in the Absence of Zero-Bias Peaks.”
    <i>Nature</i>. Springer Nature, 2022. <a href="https://doi.org/10.1038/s41586-022-05382-w">https://doi.org/10.1038/s41586-022-05382-w</a>.
  ieee: M. Valentini <i>et al.</i>, “Majorana-like Coulomb spectroscopy in the absence
    of zero-bias peaks,” <i>Nature</i>, vol. 612, no. 7940. Springer Nature, pp. 442–447,
    2022.
  ista: Valentini M, Borovkov M, Prada E, Martí-Sánchez S, Botifoll M, Hofmann AC,
    Arbiol J, Aguado R, San-Jose P, Katsaros G. 2022. Majorana-like Coulomb spectroscopy
    in the absence of zero-bias peaks. Nature. 612(7940), 442–447.
  mla: Valentini, Marco, et al. “Majorana-like Coulomb Spectroscopy in the Absence
    of Zero-Bias Peaks.” <i>Nature</i>, vol. 612, no. 7940, Springer Nature, 2022,
    pp. 442–47, doi:<a href="https://doi.org/10.1038/s41586-022-05382-w">10.1038/s41586-022-05382-w</a>.
  short: M. Valentini, M. Borovkov, E. Prada, S. Martí-Sánchez, M. Botifoll, A.C.
    Hofmann, J. Arbiol, R. Aguado, P. San-Jose, G. Katsaros, Nature 612 (2022) 442–447.
date_created: 2023-01-12T11:56:45Z
date_published: 2022-12-15T00:00:00Z
date_updated: 2024-02-21T12:35:33Z
day: '15'
department:
- _id: GeKa
doi: 10.1038/s41586-022-05382-w
ec_funded: 1
external_id:
  arxiv:
  - '2203.07829'
  isi:
  - '000899725400001'
intvolume: '       612'
isi: 1
issue: '7940'
keyword:
- Multidisciplinary
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: ' https://doi.org/10.48550/arXiv.2203.07829'
month: '12'
oa: 1
oa_version: Preprint
page: 442-447
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
publication: Nature
publication_identifier:
  eissn:
  - 1476-4687
  issn:
  - 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
  link:
  - description: News on ISTA Website
    relation: press_release
    url: https://ista.ac.at/en/news/imposter-particles-revealed-and-explained/
  record:
  - id: '13286'
    relation: dissertation_contains
    status: public
  - id: '12522'
    relation: research_data
    status: public
scopus_import: '1'
status: public
title: Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 612
year: '2022'
...
---
_id: '8909'
abstract:
- lang: eng
  text: Spin qubits are considered to be among the most promising candidates for building
    a quantum processor. Group IV hole spin qubits have moved into the focus of interest
    due to the ease of operation and compatibility with Si technology. In addition,
    Ge offers the option for monolithic superconductor-semiconductor integration.
    Here we demonstrate a hole spin qubit operating at fields below 10 mT, the critical
    field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge
    and by encoding the qubit into the singlet-triplet states of a double quantum
    dot. We observe electrically controlled X and Z-rotations with tunable frequencies
    exceeding 100 MHz and dephasing times of 1μs which we extend beyond 15μs with
    echo techniques. These results show that Ge hole singlet triplet qubits outperform
    their electronic Si and GaAs based counterparts in speed and coherence, respectively.
    In addition, they are on par with Ge single spin qubits, but can be operated at
    much lower fields underlining their potential for on chip integration with superconducting
    technologies.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: This research was supported by the Scientific Service Units of Institute
  of Science and Technology (IST) Austria through resources provided by the Miba Machine
  Shop and the nanofabrication facility, and was made possible with the support of
  the NOMIS Foundation. This project has received funding from the European Union’s
  Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant
  agreements no. 844511 and no. 75441, and by the Austrian Science Fund FWF-P 30207
  project. A.B. acknowledges support from the European Union Horizon 2020 FET project
  microSPIRE, no. 766955. M. Botifoll and J.A. acknowledge funding from Generalitat
  de Catalunya 2017 SGR 327. The Catalan Institute of Nanoscience and Nanotechnology
  (ICN2) is supported by the Severo Ochoa programme from the Spanish Ministery of
  Economy (MINECO) (grant no. SEV-2017-0706) and is funded by the Catalonian Research
  Centre (CERCA) Programme, Generalitat de Catalunya. Part of the present work has
  been performed within the framework of the Universitat Autónoma de Barcelona Materials
  Science PhD programme. Part of the HAADF scanning transmission electron microscopy
  was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia
  de Aragon, Universidad de Zaragoza. ICN2 acknowledge support from the Spanish Superior
  Council of Scientific Research (CSIC) Research Platform on Quantum Technologies
  PTI-001. M.B. acknowledges funding from the Catalan Agency for Management of University
  and Research Grants (AGAUR) Generalitat de Catalunya formation of investigators
  (FI) PhD grant.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Daniel
  full_name: Jirovec, Daniel
  id: 4C473F58-F248-11E8-B48F-1D18A9856A87
  last_name: Jirovec
  orcid: 0000-0002-7197-4801
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Andrea
  full_name: Ballabio, Andrea
  last_name: Ballabio
- first_name: Philipp M.
  full_name: Mutter, Philipp M.
  last_name: Mutter
- first_name: Giulio
  full_name: Tavani, Giulio
  last_name: Tavani
- first_name: Marc
  full_name: Botifoll, Marc
  last_name: Botifoll
- first_name: Alessandro
  full_name: Crippa, Alessandro
  id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425
  last_name: Crippa
  orcid: 0000-0002-2968-611X
- first_name: Josip
  full_name: Kukucka, Josip
  id: 3F5D8856-F248-11E8-B48F-1D18A9856A87
  last_name: Kukucka
- first_name: Oliver
  full_name: Sagi, Oliver
  id: 71616374-A8E9-11E9-A7CA-09ECE5697425
  last_name: Sagi
- first_name: Frederico
  full_name: Martins, Frederico
  id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E
  last_name: Martins
  orcid: 0000-0003-2668-2401
- first_name: Jaime
  full_name: Saez Mollejo, Jaime
  id: e0390f72-f6e0-11ea-865d-862393336714
  last_name: Saez Mollejo
- first_name: Ivan
  full_name: Prieto Gonzalez, Ivan
  id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
  last_name: Prieto Gonzalez
  orcid: 0000-0002-7370-5357
- first_name: Maksim
  full_name: Borovkov, Maksim
  id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087
  last_name: Borovkov
- first_name: Jordi
  full_name: Arbiol, Jordi
  last_name: Arbiol
- first_name: Daniel
  full_name: Chrastina, Daniel
  last_name: Chrastina
- first_name: Giovanni
  full_name: Isella, Giovanni
  last_name: Isella
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Jirovec D, Hofmann AC, Ballabio A, et al. A singlet triplet hole spin qubit
    in planar Ge. <i>Nature Materials</i>. 2021;20(8):1106–1112. doi:<a href="https://doi.org/10.1038/s41563-021-01022-2">10.1038/s41563-021-01022-2</a>
  apa: Jirovec, D., Hofmann, A. C., Ballabio, A., Mutter, P. M., Tavani, G., Botifoll,
    M., … Katsaros, G. (2021). A singlet triplet hole spin qubit in planar Ge. <i>Nature
    Materials</i>. Springer Nature. <a href="https://doi.org/10.1038/s41563-021-01022-2">https://doi.org/10.1038/s41563-021-01022-2</a>
  chicago: Jirovec, Daniel, Andrea C Hofmann, Andrea Ballabio, Philipp M. Mutter,
    Giulio Tavani, Marc Botifoll, Alessandro Crippa, et al. “A Singlet Triplet Hole
    Spin Qubit in Planar Ge.” <i>Nature Materials</i>. Springer Nature, 2021. <a href="https://doi.org/10.1038/s41563-021-01022-2">https://doi.org/10.1038/s41563-021-01022-2</a>.
  ieee: D. Jirovec <i>et al.</i>, “A singlet triplet hole spin qubit in planar Ge,”
    <i>Nature Materials</i>, vol. 20, no. 8. Springer Nature, pp. 1106–1112, 2021.
  ista: Jirovec D, Hofmann AC, Ballabio A, Mutter PM, Tavani G, Botifoll M, Crippa
    A, Kukucka J, Sagi O, Martins F, Saez Mollejo J, Prieto Gonzalez I, Borovkov M,
    Arbiol J, Chrastina D, Isella G, Katsaros G. 2021. A singlet triplet hole spin
    qubit in planar Ge. Nature Materials. 20(8), 1106–1112.
  mla: Jirovec, Daniel, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” <i>Nature
    Materials</i>, vol. 20, no. 8, Springer Nature, 2021, pp. 1106–1112, doi:<a href="https://doi.org/10.1038/s41563-021-01022-2">10.1038/s41563-021-01022-2</a>.
  short: D. Jirovec, A.C. Hofmann, A. Ballabio, P.M. Mutter, G. Tavani, M. Botifoll,
    A. Crippa, J. Kukucka, O. Sagi, F. Martins, J. Saez Mollejo, I. Prieto Gonzalez,
    M. Borovkov, J. Arbiol, D. Chrastina, G. Isella, G. Katsaros, Nature Materials
    20 (2021) 1106–1112.
date_created: 2020-12-02T10:50:47Z
date_published: 2021-08-01T00:00:00Z
date_updated: 2024-03-25T23:30:14Z
day: '01'
department:
- _id: GeKa
- _id: NanoFab
- _id: GradSch
doi: 10.1038/s41563-021-01022-2
ec_funded: 1
external_id:
  arxiv:
  - '2011.13755'
  isi:
  - '000657596400001'
intvolume: '        20'
isi: 1
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2011.13755
month: '08'
oa: 1
oa_version: Preprint
page: 1106–1112
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P30207
  name: Hole spin orbit qubits in Ge quantum wells
- _id: 262116AA-B435-11E9-9278-68D0E5697425
  name: Hybrid Semiconductor - Superconductor Quantum Devices
publication: Nature Materials
publication_identifier:
  eissn:
  - 1476-4660
  issn:
  - 1476-1122
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
  link:
  - description: News on IST Homepage
    relation: press_release
    url: https://ist.ac.at/en/news/quantum-computing-with-holes/
  record:
  - id: '9323'
    relation: research_data
    status: public
  - id: '10058'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: A singlet triplet hole spin qubit in planar Ge
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 20
year: '2021'
...
---
_id: '8910'
abstract:
- lang: eng
  text: A semiconducting nanowire fully wrapped by a superconducting shell has been
    proposed as a platform for obtaining Majorana modes at small magnetic fields.
    In this study, we demonstrate that the appearance of subgap states in such structures
    is actually governed by the junction region in tunneling spectroscopy measurements
    and not the full-shell nanowire itself. Short tunneling regions never show subgap
    states, whereas longer junctions always do. This can be understood in terms of
    quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov
    regime. The intricate magnetic field dependence of the Andreev levels, through
    both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks—features
    that could be easily misinterpreted as originating from Majorana zero modes but
    are unrelated to topological superconductivity.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: The authors thank A. Higginbotham, E. J. H. Lee and F. R. Martins
  for helpful discussions. This research was supported by the Scientific Service Units
  of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication
  facility; the NOMIS Foundation and Microsoft; the European Union’s Horizon 2020
  research and innovation program under the Marie SklodowskaCurie grant agreement
  No 844511; the FETOPEN Grant Agreement No. 828948; the European Research Commission
  through the grant agreement HEMs-DAM No 716655; the Spanish Ministry of Science
  and Innovation through Grants PGC2018-097018-B-I00, PCI2018-093026, FIS2016-80434-P
  (AEI/FEDER, EU), RYC2011-09345 (Ram´on y Cajal Programme), and the Mar´ıa de Maeztu
  Programme for Units of Excellence in R&D (CEX2018-000805-M); the CSIC Research Platform
  on Quantum Technologies PTI-001.
article_number: 82-88
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Marco
  full_name: Valentini, Marco
  id: C0BB2FAC-D767-11E9-B658-BC13E6697425
  last_name: Valentini
- first_name: Fernando
  full_name: Peñaranda, Fernando
  last_name: Peñaranda
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Matthias
  full_name: Brauns, Matthias
  id: 33F94E3C-F248-11E8-B48F-1D18A9856A87
  last_name: Brauns
- first_name: Robert
  full_name: Hauschild, Robert
  id: 4E01D6B4-F248-11E8-B48F-1D18A9856A87
  last_name: Hauschild
  orcid: 0000-0001-9843-3522
- first_name: Peter
  full_name: Krogstrup, Peter
  last_name: Krogstrup
- first_name: Pablo
  full_name: San-Jose, Pablo
  last_name: San-Jose
- first_name: Elsa
  full_name: Prada, Elsa
  last_name: Prada
- first_name: Ramón
  full_name: Aguado, Ramón
  last_name: Aguado
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Valentini M, Peñaranda F, Hofmann AC, et al. Nontopological zero-bias peaks
    in full-shell nanowires induced by flux-tunable Andreev states. <i>Science</i>.
    2021;373(6550). doi:<a href="https://doi.org/10.1126/science.abf1513">10.1126/science.abf1513</a>
  apa: Valentini, M., Peñaranda, F., Hofmann, A. C., Brauns, M., Hauschild, R., Krogstrup,
    P., … Katsaros, G. (2021). Nontopological zero-bias peaks in full-shell nanowires
    induced by flux-tunable Andreev states. <i>Science</i>. American Association for
    the Advancement of Science. <a href="https://doi.org/10.1126/science.abf1513">https://doi.org/10.1126/science.abf1513</a>
  chicago: Valentini, Marco, Fernando Peñaranda, Andrea C Hofmann, Matthias Brauns,
    Robert Hauschild, Peter Krogstrup, Pablo San-Jose, Elsa Prada, Ramón Aguado, and
    Georgios Katsaros. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced
    by Flux-Tunable Andreev States.” <i>Science</i>. American Association for the
    Advancement of Science, 2021. <a href="https://doi.org/10.1126/science.abf1513">https://doi.org/10.1126/science.abf1513</a>.
  ieee: M. Valentini <i>et al.</i>, “Nontopological zero-bias peaks in full-shell
    nanowires induced by flux-tunable Andreev states,” <i>Science</i>, vol. 373, no.
    6550. American Association for the Advancement of Science, 2021.
  ista: Valentini M, Peñaranda F, Hofmann AC, Brauns M, Hauschild R, Krogstrup P,
    San-Jose P, Prada E, Aguado R, Katsaros G. 2021. Nontopological zero-bias peaks
    in full-shell nanowires induced by flux-tunable Andreev states. Science. 373(6550),
    82–88.
  mla: Valentini, Marco, et al. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires
    Induced by Flux-Tunable Andreev States.” <i>Science</i>, vol. 373, no. 6550, 82–88,
    American Association for the Advancement of Science, 2021, doi:<a href="https://doi.org/10.1126/science.abf1513">10.1126/science.abf1513</a>.
  short: M. Valentini, F. Peñaranda, A.C. Hofmann, M. Brauns, R. Hauschild, P. Krogstrup,
    P. San-Jose, E. Prada, R. Aguado, G. Katsaros, Science 373 (2021).
date_created: 2020-12-02T10:51:52Z
date_published: 2021-07-02T00:00:00Z
date_updated: 2024-02-21T12:40:09Z
day: '02'
department:
- _id: GeKa
- _id: Bio
doi: 10.1126/science.abf1513
ec_funded: 1
external_id:
  arxiv:
  - '2008.02348'
  isi:
  - '000677843100034'
intvolume: '       373'
isi: 1
issue: '6550'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2008.02348
month: '07'
oa: 1
oa_version: Submitted Version
project:
- _id: 262116AA-B435-11E9-9278-68D0E5697425
  name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
publication: Science
publication_identifier:
  eissn:
  - '10959203'
  issn:
  - '00368075'
publication_status: published
publisher: American Association for the Advancement of Science
quality_controlled: '1'
related_material:
  link:
  - description: News on IST Homepage
    relation: press_release
    url: https://ist.ac.at/en/news/unfinding-a-split-electron/
  record:
  - id: '13286'
    relation: dissertation_contains
    status: public
  - id: '9389'
    relation: research_data
    status: public
scopus_import: '1'
status: public
title: Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable
  Andreev states
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 373
year: '2021'
...
---
_id: '10559'
abstract:
- lang: eng
  text: Hole gases in planar germanium can have high mobilities in combination with
    strong spin-orbit interaction and electrically tunable g factors, and are therefore
    emerging as a promising platform for creating hybrid superconductor-semiconductor
    devices. A key challenge towards hybrid Ge-based quantum technologies is the design
    of high-quality interfaces and superconducting contacts that are robust against
    magnetic fields. In this work, by combining the assets of aluminum, which provides
    good contact to the Ge, and niobium, which has a significant superconducting gap,
    we demonstrate highly transparent low-disordered JoFETs with relatively large
    ICRN products that are capable of withstanding high magnetic fields. We furthermore
    demonstrate the ability of phase-biasing individual JoFETs, opening up an avenue
    to explore topological superconductivity in planar Ge. The persistence of superconductivity
    in the reported hybrid devices beyond 1.8 T paves the way towards integrating
    spin qubits and proximity-induced superconductivity on the same chip.
acknowledged_ssus:
- _id: NanoFab
- _id: M-Shop
acknowledgement: This research and related results were made possible with the support
  of the NOMIS Foundation. This research was supported by the Scientific Service Units
  of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication
  facility, the European Union's Horizon 2020 research and innovation program under
  the Marie Sklodowska-Curie Grant agreement No. 844511 Grant Agreement No. 862046.
  ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported
  by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is
  funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work
  has been performed in the framework of Universitat Autnoma de Barcelona Materials
  Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio
  de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza.
  Authors acknowledge the LMA-INA for offering access to their instruments and expertise.
  We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001.
  This project has received funding from the European Union's Horizon 2020 research
  and innovation programme under Grant Agreement No. 823717 ESTEEM3. M.B. acknowledges
  support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020
  FI 00103. G.S. and M.V. acknowledge support through a projectruimte grant associated
  with the Netherlands Organization of Scientific Research (NWO). J.D. acknowledges
  support through FRIPRO-project 274853, which is funded by the Research Council of
  Norway.
article_number: L022005
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Kushagra
  full_name: Aggarwal, Kushagra
  id: b22ab905-3539-11eb-84c3-fc159dcd79cb
  last_name: Aggarwal
  orcid: 0000-0001-9985-9293
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Daniel
  full_name: Jirovec, Daniel
  id: 4C473F58-F248-11E8-B48F-1D18A9856A87
  last_name: Jirovec
  orcid: 0000-0002-7197-4801
- first_name: Ivan
  full_name: Prieto Gonzalez, Ivan
  id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
  last_name: Prieto Gonzalez
  orcid: 0000-0002-7370-5357
- first_name: Amir
  full_name: Sammak, Amir
  last_name: Sammak
- first_name: Marc
  full_name: Botifoll, Marc
  last_name: Botifoll
- first_name: Sara
  full_name: Martí-Sánchez, Sara
  last_name: Martí-Sánchez
- first_name: Menno
  full_name: Veldhorst, Menno
  last_name: Veldhorst
- first_name: Jordi
  full_name: Arbiol, Jordi
  last_name: Arbiol
- first_name: Giordano
  full_name: Scappucci, Giordano
  last_name: Scappucci
- first_name: Jeroen
  full_name: Danon, Jeroen
  last_name: Danon
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity-induced
    superconductivity in a planar Ge hole gas. <i>Physical Review Research</i>. 2021;3(2).
    doi:<a href="https://doi.org/10.1103/physrevresearch.3.l022005">10.1103/physrevresearch.3.l022005</a>
  apa: Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A.,
    Botifoll, M., … Katsaros, G. (2021). Enhancement of proximity-induced superconductivity
    in a planar Ge hole gas. <i>Physical Review Research</i>. American Physical Society.
    <a href="https://doi.org/10.1103/physrevresearch.3.l022005">https://doi.org/10.1103/physrevresearch.3.l022005</a>
  chicago: Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez,
    Amir Sammak, Marc Botifoll, Sara Martí-Sánchez, et al. “Enhancement of Proximity-Induced
    Superconductivity in a Planar Ge Hole Gas.” <i>Physical Review Research</i>. American
    Physical Society, 2021. <a href="https://doi.org/10.1103/physrevresearch.3.l022005">https://doi.org/10.1103/physrevresearch.3.l022005</a>.
  ieee: K. Aggarwal <i>et al.</i>, “Enhancement of proximity-induced superconductivity
    in a planar Ge hole gas,” <i>Physical Review Research</i>, vol. 3, no. 2. American
    Physical Society, 2021.
  ista: Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M,
    Martí-Sánchez S, Veldhorst M, Arbiol J, Scappucci G, Danon J, Katsaros G. 2021.
    Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical
    Review Research. 3(2), L022005.
  mla: Aggarwal, Kushagra, et al. “Enhancement of Proximity-Induced Superconductivity
    in a Planar Ge Hole Gas.” <i>Physical Review Research</i>, vol. 3, no. 2, L022005,
    American Physical Society, 2021, doi:<a href="https://doi.org/10.1103/physrevresearch.3.l022005">10.1103/physrevresearch.3.l022005</a>.
  short: K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M.
    Botifoll, S. Martí-Sánchez, M. Veldhorst, J. Arbiol, G. Scappucci, J. Danon, G.
    Katsaros, Physical Review Research 3 (2021).
date_created: 2021-12-16T18:50:57Z
date_published: 2021-04-15T00:00:00Z
date_updated: 2024-02-21T12:41:26Z
day: '15'
ddc:
- '620'
department:
- _id: GeKa
doi: 10.1103/physrevresearch.3.l022005
ec_funded: 1
external_id:
  arxiv:
  - '2012.00322'
file:
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  file_id: '10561'
  file_name: 2021_PhysRevResearch_Aggarwal.pdf
  file_size: 1917512
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  success: 1
file_date_updated: 2021-12-17T08:12:37Z
has_accepted_license: '1'
intvolume: '         3'
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keyword:
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language:
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month: '04'
oa: 1
oa_version: Published Version
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
  call_identifier: H2020
  grant_number: '862046'
  name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
  record:
  - id: '8831'
    relation: earlier_version
    status: public
  - id: '8834'
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scopus_import: '1'
status: public
title: Enhancement of proximity-induced superconductivity in a planar Ge hole gas
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 3
year: '2021'
...
---
_id: '8831'
abstract:
- lang: eng
  text: Holes in planar Ge have high mobilities, strong spin-orbit interaction and
    electrically tunable g-factors, and are therefore emerging as a promising candidate
    for hybrid superconductorsemiconductor devices. This is further motivated by the
    observation of supercurrent transport in planar Ge Josephson Field effect transistors
    (JoFETs). A key challenge towards hybrid germanium quantum technology is the design
    of high quality interfaces and superconducting contacts that are robust against
    magnetic fields. By combining the assets of Al, which has a long superconducting
    coherence, and Nb, which has a significant superconducting gap, we form low-disordered
    JoFETs with large ICRN products that are capable of withstanding high magnetic
    fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs
    opening up an avenue to explore topological superconductivity in planar Ge. The
    persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves
    the way towards integrating spin qubits and proximity-induced superconductivity
    on the same chip.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "This research and related results were made possible with the support
  of the NOMIS Foundation. This research was supported by the Scientific Service Units
  of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication
  facility, the European Union’s Horizon 2020 research and innovation program under
  the Marie Sklodowska-Curie grant agreement #844511 and the Grant Agreement #862046.
  ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported
  by the Severo Ochoa\r\nprogram from Spanish MINECO (Grant No. SEV2017-0706) and
  is funded by the CERCA Programme / Generalitat de Catalunya. Part of the present
  work has been performed in the framework of Universitat Aut`onoma de Barcelona Materials
  Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio
  de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza.
  Authors acknowledge the LMA-INA for offering access to their instruments and expertise.
  We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001.
  This project has received funding from\r\nthe European Union’s Horizon 2020 research
  and innovation programme under grant agreement No 823717 – ESTEEM3. M.B. acknowledges
  support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020
  FI 00103. GS and MV acknowledge support through a projectruimte grant associated
  with the Netherlands Organization of Scientific Research (NWO)."
article_number: '2012.00322'
article_processing_charge: No
arxiv: 1
author:
- first_name: Kushagra
  full_name: Aggarwal, Kushagra
  id: b22ab905-3539-11eb-84c3-fc159dcd79cb
  last_name: Aggarwal
  orcid: 0000-0001-9985-9293
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Daniel
  full_name: Jirovec, Daniel
  id: 4C473F58-F248-11E8-B48F-1D18A9856A87
  last_name: Jirovec
  orcid: 0000-0002-7197-4801
- first_name: Ivan
  full_name: Prieto Gonzalez, Ivan
  id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
  last_name: Prieto Gonzalez
  orcid: 0000-0002-7370-5357
- first_name: Amir
  full_name: Sammak, Amir
  last_name: Sammak
- first_name: Marc
  full_name: Botifoll, Marc
  last_name: Botifoll
- first_name: Sara
  full_name: Marti-Sanchez, Sara
  last_name: Marti-Sanchez
- first_name: Menno
  full_name: Veldhorst, Menno
  last_name: Veldhorst
- first_name: Jordi
  full_name: Arbiol, Jordi
  last_name: Arbiol
- first_name: Giordano
  full_name: Scappucci, Giordano
  last_name: Scappucci
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity induced
    superconductivity in planar Germanium. <i>arXiv</i>.
  apa: Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A.,
    Botifoll, M., … Katsaros, G. (n.d.). Enhancement of proximity induced superconductivity
    in planar Germanium. <i>arXiv</i>.
  chicago: Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez,
    Amir Sammak, Marc Botifoll, Sara Marti-Sanchez, et al. “Enhancement of Proximity
    Induced Superconductivity in Planar Germanium.” <i>ArXiv</i>, n.d.
  ieee: K. Aggarwal <i>et al.</i>, “Enhancement of proximity induced superconductivity
    in planar Germanium,” <i>arXiv</i>. .
  ista: Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M,
    Marti-Sanchez S, Veldhorst M, Arbiol J, Scappucci G, Katsaros G. Enhancement of
    proximity induced superconductivity in planar Germanium. arXiv, 2012.00322.
  mla: Aggarwal, Kushagra, et al. “Enhancement of Proximity Induced Superconductivity
    in Planar Germanium.” <i>ArXiv</i>, 2012.00322.
  short: K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M.
    Botifoll, S. Marti-Sanchez, M. Veldhorst, J. Arbiol, G. Scappucci, G. Katsaros,
    ArXiv (n.d.).
date_created: 2020-12-02T10:42:53Z
date_published: 2020-12-02T00:00:00Z
date_updated: 2024-03-25T23:30:14Z
day: '02'
ddc:
- '530'
department:
- _id: GeKa
ec_funded: 1
external_id:
  arxiv:
  - '2012.00322'
file:
- access_level: open_access
  checksum: 22a612e206232fa94b138b2c2f957582
  content_type: application/pdf
  creator: gkatsaro
  date_created: 2020-12-02T10:42:31Z
  date_updated: 2020-12-02T10:42:31Z
  file_id: '8832'
  file_name: Superconducting_2D_Ge.pdf
  file_size: 1697939
  relation: main_file
file_date_updated: 2020-12-02T10:42:31Z
has_accepted_license: '1'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Submitted Version
project:
- _id: 262116AA-B435-11E9-9278-68D0E5697425
  name: Hybrid Semiconductor - Superconductor Quantum Devices
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
- _id: 237E5020-32DE-11EA-91FC-C7463DDC885E
  call_identifier: H2020
  grant_number: '862046'
  name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS
publication: arXiv
publication_status: submitted
related_material:
  record:
  - id: '10559'
    relation: later_version
    status: public
  - id: '8834'
    relation: research_data
    status: public
  - id: '10058'
    relation: dissertation_contains
    status: public
status: public
title: Enhancement of proximity induced superconductivity in planar Germanium
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2020'
...
---
_id: '10065'
abstract:
- lang: eng
  text: We study double quantum dots in a Ge/SiGe heterostructure and test their maturity
    towards singlet-triplet ($S-T_0$) qubits. We demonstrate a large range of tunability,
    from two single quantum dots to a double quantum dot. We measure Pauli spin blockade
    and study the anisotropy of the $g$-factor. We use an adjacent quantum dot for
    sensing charge transitions in the double quantum dot at interest. In conclusion,
    Ge/SiGe possesses all ingredients necessary for building a singlet-triplet qubit.
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
acknowledgement: "We thank Matthias Brauns for helpful discussions and careful proofreading
  of the manuscript. This project has received funding from the European Union’s Horizon
  2020 research and innovation program under the Marie Sklodowska-Curie grant agreement
  No 844511 and from the FWF project P30207. The research was supported by the Scientific
  Service Units of IST Austria through resources provided by the MIBA machine shop
  and the nanofabrication\r\nfacility."
article_number: '1910.05841'
article_processing_charge: No
arxiv: 1
author:
- first_name: Andrea C
  full_name: Hofmann, Andrea C
  id: 340F461A-F248-11E8-B48F-1D18A9856A87
  last_name: Hofmann
- first_name: Daniel
  full_name: Jirovec, Daniel
  id: 4C473F58-F248-11E8-B48F-1D18A9856A87
  last_name: Jirovec
  orcid: 0000-0002-7197-4801
- first_name: Maxim
  full_name: Borovkov, Maxim
  last_name: Borovkov
- first_name: Ivan
  full_name: Prieto Gonzalez, Ivan
  id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
  last_name: Prieto Gonzalez
  orcid: 0000-0002-7370-5357
- first_name: Andrea
  full_name: Ballabio, Andrea
  last_name: Ballabio
- first_name: Jacopo
  full_name: Frigerio, Jacopo
  last_name: Frigerio
- first_name: Daniel
  full_name: Chrastina, Daniel
  last_name: Chrastina
- first_name: Giovanni
  full_name: Isella, Giovanni
  last_name: Isella
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
  orcid: 0000-0001-8342-202X
citation:
  ama: Hofmann AC, Jirovec D, Borovkov M, et al. Assessing the potential of Ge/SiGe
    quantum dots as hosts for singlet-triplet qubits. <i>arXiv</i>. doi:<a href="https://doi.org/10.48550/arXiv.1910.05841">10.48550/arXiv.1910.05841</a>
  apa: Hofmann, A. C., Jirovec, D., Borovkov, M., Prieto Gonzalez, I., Ballabio, A.,
    Frigerio, J., … Katsaros, G. (n.d.). Assessing the potential of Ge/SiGe quantum
    dots as hosts for singlet-triplet qubits. <i>arXiv</i>. <a href="https://doi.org/10.48550/arXiv.1910.05841">https://doi.org/10.48550/arXiv.1910.05841</a>
  chicago: Hofmann, Andrea C, Daniel Jirovec, Maxim Borovkov, Ivan Prieto Gonzalez,
    Andrea Ballabio, Jacopo Frigerio, Daniel Chrastina, Giovanni Isella, and Georgios
    Katsaros. “Assessing the Potential of Ge/SiGe Quantum Dots as Hosts for Singlet-Triplet
    Qubits.” <i>ArXiv</i>, n.d. <a href="https://doi.org/10.48550/arXiv.1910.05841">https://doi.org/10.48550/arXiv.1910.05841</a>.
  ieee: A. C. Hofmann <i>et al.</i>, “Assessing the potential of Ge/SiGe quantum dots
    as hosts for singlet-triplet qubits,” <i>arXiv</i>. .
  ista: Hofmann AC, Jirovec D, Borovkov M, Prieto Gonzalez I, Ballabio A, Frigerio
    J, Chrastina D, Isella G, Katsaros G. Assessing the potential of Ge/SiGe quantum
    dots as hosts for singlet-triplet qubits. arXiv, 1910.05841.
  mla: Hofmann, Andrea C., et al. “Assessing the Potential of Ge/SiGe Quantum Dots
    as Hosts for Singlet-Triplet Qubits.” <i>ArXiv</i>, 1910.05841, doi:<a href="https://doi.org/10.48550/arXiv.1910.05841">10.48550/arXiv.1910.05841</a>.
  short: A.C. Hofmann, D. Jirovec, M. Borovkov, I. Prieto Gonzalez, A. Ballabio, J.
    Frigerio, D. Chrastina, G. Isella, G. Katsaros, ArXiv (n.d.).
date_created: 2021-10-01T12:14:51Z
date_published: 2019-10-13T00:00:00Z
date_updated: 2024-03-25T23:30:14Z
day: '13'
department:
- _id: GeKa
doi: 10.48550/arXiv.1910.05841
ec_funded: 1
external_id:
  arxiv:
  - '1910.05841'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1910.05841
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 26A151DA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '844511'
  name: Majorana bound states in Ge/SiGe heterostructures
- _id: 2641CE5E-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P30207
  name: Hole spin orbit qubits in Ge quantum wells
publication: arXiv
publication_status: submitted
related_material:
  record:
  - id: '10058'
    relation: dissertation_contains
    status: public
status: public
title: Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet
  qubits
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2019'
...