---
_id: '12213'
abstract:
- lang: eng
text: 'Motivated by properties-controlling potential of the strain, we investigate
strain dependence of structure, electronic, and magnetic properties of Sr2IrO4
using complementary theoretical tools: ab-initio calculations, analytical approaches
(rigid octahedra picture, Slater-Koster integrals), and extended t−J model. We
find that strain affects both Ir-Ir distance and Ir-O-Ir angle, and the rigid
octahedra picture is not relevant. Second, we find fundamentally different behavior
for compressive and tensile strain. One remarkable feature is the formation of
two subsets of bond- and orbital-dependent carriers, a compass-like model, under
compression. This originates from the strain-induced renormalization of the Ir-O-Ir
superexchange and O on-site energy. We also show that under compressive (tensile)
strain, Fermi surface becomes highly dispersive (relatively flat). Already at
a tensile strain of 1.5%, we observe spectral weight redistribution, with the
low-energy band acquiring almost purely singlet character. These results can be
directly compared with future experiments.'
acknowledgement: E.M.P. thanks Eugenio Paris, Thorsten Schmitt, Krzysztof Wohlfeld,
and other coauthors for an inspiring previous collaboration23, and is grateful to
Gang Cao, Ambrose Seo, and Jungho Kim for insightful discussions. R.R. acknowledges
helpful discussion with Sanjeev Kumar and Manuel Richter. This project has received
funding from the European Union’s Horizon 2020 research and innovation program under
the Marie Sklodowska-Curie grant agreement No 754411. C.C.C. acknowledges support
from the U.S. National Science Foundation Award No. DMR-2142801.
article_number: '90'
article_processing_charge: No
article_type: original
author:
- first_name: Ekaterina
full_name: Paerschke, Ekaterina
id: 8275014E-6063-11E9-9B7F-6338E6697425
last_name: Paerschke
orcid: 0000-0003-0853-8182
- first_name: Wei-Chih
full_name: Chen, Wei-Chih
last_name: Chen
- first_name: Rajyavardhan
full_name: Ray, Rajyavardhan
last_name: Ray
- first_name: Cheng-Chien
full_name: Chen, Cheng-Chien
last_name: Chen
citation:
ama: Paerschke E, Chen W-C, Ray R, Chen C-C. Evolution of electronic and magnetic
properties of Sr₂IrO₄ under strain. npj Quantum Materials. 2022;7. doi:10.1038/s41535-022-00496-w
apa: Paerschke, E., Chen, W.-C., Ray, R., & Chen, C.-C. (2022). Evolution of
electronic and magnetic properties of Sr₂IrO₄ under strain. Npj Quantum Materials.
Springer Nature. https://doi.org/10.1038/s41535-022-00496-w
chicago: Paerschke, Ekaterina, Wei-Chih Chen, Rajyavardhan Ray, and Cheng-Chien
Chen. “Evolution of Electronic and Magnetic Properties of Sr₂IrO₄ under Strain.”
Npj Quantum Materials. Springer Nature, 2022. https://doi.org/10.1038/s41535-022-00496-w.
ieee: E. Paerschke, W.-C. Chen, R. Ray, and C.-C. Chen, “Evolution of electronic
and magnetic properties of Sr₂IrO₄ under strain,” npj Quantum Materials,
vol. 7. Springer Nature, 2022.
ista: Paerschke E, Chen W-C, Ray R, Chen C-C. 2022. Evolution of electronic and
magnetic properties of Sr₂IrO₄ under strain. npj Quantum Materials. 7, 90.
mla: Paerschke, Ekaterina, et al. “Evolution of Electronic and Magnetic Properties
of Sr₂IrO₄ under Strain.” Npj Quantum Materials, vol. 7, 90, Springer Nature,
2022, doi:10.1038/s41535-022-00496-w.
short: E. Paerschke, W.-C. Chen, R. Ray, C.-C. Chen, Npj Quantum Materials 7 (2022).
date_created: 2023-01-16T09:46:01Z
date_published: 2022-09-10T00:00:00Z
date_updated: 2023-08-04T09:23:43Z
day: '10'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1038/s41535-022-00496-w
ec_funded: 1
external_id:
isi:
- '000852381200003'
file:
- access_level: open_access
checksum: d93b477b5b95c0d1b8f9fef90a81f565
content_type: application/pdf
creator: dernst
date_created: 2023-01-27T07:59:27Z
date_updated: 2023-01-27T07:59:27Z
file_id: '12414'
file_name: 2022_NPJ_Paerschke.pdf
file_size: 1852598
relation: main_file
success: 1
file_date_updated: 2023-01-27T07:59:27Z
has_accepted_license: '1'
intvolume: ' 7'
isi: 1
keyword:
- Condensed Matter Physics
- Electronic
- Optical and Magnetic Materials
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: npj Quantum Materials
publication_identifier:
eissn:
- 2397-4648
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- relation: erratum
url: https://doi.org/10.1038/s41535-022-00510-1
scopus_import: '1'
status: public
title: Evolution of electronic and magnetic properties of Sr₂IrO₄ under strain
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: 7
year: '2022'
...
---
_id: '12071'
abstract:
- lang: eng
text: Despite many efforts to rationalize the strongly correlated electronic ground
states in doped Mott insulators, the nature of the doping-induced insulator-to-metal
transition is still a subject under intensive investigation. Here, we probe the
nanoscale electronic structure of the Mott insulator Sr₂IrO₄δ with low-temperature
scanning tunneling microscopy and find an enhanced local density of states (LDOS)
inside the Mott gap at the location of individual defects which we interpret as
defects at apical oxygen sites. A chiral behavior in the topography for those
defects has been observed. We also visualize the local enhanced conductance arising
from the overlapping of defect states which induces finite LDOS inside of the
Mott gap. By combining these findings with the typical spatial extension of isolated
defects of about 2 nm, our results indicate that the insulator-to-metal transition
in Sr₂IrO₄−δ could be percolative in nature.
article_number: '023075'
article_processing_charge: No
article_type: original
author:
- first_name: Zhixiang
full_name: Sun, Zhixiang
last_name: Sun
- first_name: Jose M.
full_name: Guevara, Jose M.
last_name: Guevara
- first_name: Steffen
full_name: Sykora, Steffen
last_name: Sykora
- first_name: Ekaterina
full_name: Paerschke, Ekaterina
id: 8275014E-6063-11E9-9B7F-6338E6697425
last_name: Paerschke
orcid: 0000-0003-0853-8182
- first_name: Kaustuv
full_name: Manna, Kaustuv
last_name: Manna
- first_name: Andrey
full_name: Maljuk, Andrey
last_name: Maljuk
- first_name: Sabine
full_name: Wurmehl, Sabine
last_name: Wurmehl
- first_name: Jeroen
full_name: van den Brink, Jeroen
last_name: van den Brink
- first_name: Bernd
full_name: Büchner, Bernd
last_name: Büchner
- first_name: Christian
full_name: Hess, Christian
last_name: Hess
citation:
ama: Sun Z, Guevara JM, Sykora S, et al. Evidence for a percolative Mott insulator-metal
transition in doped Sr₂IrO₄. Physical Review Research. 2021;3(2). doi:10.1103/physrevresearch.3.023075
apa: Sun, Z., Guevara, J. M., Sykora, S., Paerschke, E., Manna, K., Maljuk, A.,
… Hess, C. (2021). Evidence for a percolative Mott insulator-metal transition
in doped Sr₂IrO₄. Physical Review Research. American Physical Society.
https://doi.org/10.1103/physrevresearch.3.023075
chicago: Sun, Zhixiang, Jose M. Guevara, Steffen Sykora, Ekaterina Paerschke, Kaustuv
Manna, Andrey Maljuk, Sabine Wurmehl, Jeroen van den Brink, Bernd Büchner, and
Christian Hess. “Evidence for a Percolative Mott Insulator-Metal Transition in
Doped Sr₂IrO₄.” Physical Review Research. American Physical Society, 2021.
https://doi.org/10.1103/physrevresearch.3.023075.
ieee: Z. Sun et al., “Evidence for a percolative Mott insulator-metal transition
in doped Sr₂IrO₄,” Physical Review Research, vol. 3, no. 2. American Physical
Society, 2021.
ista: Sun Z, Guevara JM, Sykora S, Paerschke E, Manna K, Maljuk A, Wurmehl S, van
den Brink J, Büchner B, Hess C. 2021. Evidence for a percolative Mott insulator-metal
transition in doped Sr₂IrO₄. Physical Review Research. 3(2), 023075.
mla: Sun, Zhixiang, et al. “Evidence for a Percolative Mott Insulator-Metal Transition
in Doped Sr₂IrO₄.” Physical Review Research, vol. 3, no. 2, 023075, American
Physical Society, 2021, doi:10.1103/physrevresearch.3.023075.
short: Z. Sun, J.M. Guevara, S. Sykora, E. Paerschke, K. Manna, A. Maljuk, S. Wurmehl,
J. van den Brink, B. Büchner, C. Hess, Physical Review Research 3 (2021).
date_created: 2022-09-08T15:01:16Z
date_published: 2021-04-27T00:00:00Z
date_updated: 2022-09-09T07:26:01Z
day: '27'
ddc:
- '530'
doi: 10.1103/physrevresearch.3.023075
extern: '1'
file:
- access_level: open_access
checksum: 73f1331b9716295849e87a7d3acd9323
content_type: application/pdf
creator: dernst
date_created: 2022-09-09T07:23:40Z
date_updated: 2022-09-09T07:23:40Z
file_id: '12075'
file_name: 2021_PhysicalRevResearch_Sun.pdf
file_size: 4020901
relation: main_file
success: 1
file_date_updated: 2022-09-09T07:23:40Z
has_accepted_license: '1'
intvolume: ' 3'
issue: '2'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: Physical Review Research
publication_identifier:
issn:
- 2643-1564
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Evidence for a percolative Mott insulator-metal transition in doped Sr₂IrO₄
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2021'
...
---
_id: '8699'
abstract:
- lang: eng
text: In the high spin–orbit-coupled Sr2IrO4, the high sensitivity of the ground
state to the details of the local lattice structure shows a large potential for
the manipulation of the functional properties by inducing local lattice distortions.
We use epitaxial strain to modify the Ir–O bond geometry in Sr2IrO4 and perform
momentum-dependent resonant inelastic X-ray scattering (RIXS) at the metal and
at the ligand sites to unveil the response of the low-energy elementary excitations.
We observe that the pseudospin-wave dispersion for tensile-strained Sr2IrO4 films
displays large softening along the [h,0] direction, while along the [h,h] direction
it shows hardening. This evolution reveals a renormalization of the magnetic interactions
caused by a strain-driven cross-over from anisotropic to isotropic interactions
between the magnetic moments. Moreover, we detect dispersive electron–hole pair
excitations which shift to lower (higher) energies upon compressive (tensile)
strain, manifesting a reduction (increase) in the size of the charge gap. This
behavior shows an intimate coupling between charge excitations and lattice distortions
in Sr2IrO4, originating from the modified hopping elements between the t2g orbitals.
Our work highlights the central role played by the lattice degrees of freedom
in determining both the pseudospin and charge excitations of Sr2IrO4 and provides
valuable information toward the control of the ground state of complex oxides
in the presence of high spin–orbit coupling.
acknowledgement: 'We gratefully acknowledge C. Sahle for experimental support at the
ID20 beamline of the ESRF. The soft X-ray experiments were carried out at the ADRESS
beamline of the Swiss Light Source, Paul Scherrer Institut (PSI). E. Paris and T.S.
thank X. Lu and C. Monney for valuable discussions. The work at PSI is supported
by the Swiss National Science Foundation (SNSF) through Project 200021_178867, the
NCCR (National Centre of Competence in Research) MARVEL (Materials’ Revolution:
Computational Design and Discovery of Novel Materials) and the Sinergia network
Mott Physics Beyond the Heisenberg Model (MPBH) (SNSF Research Grants CRSII2_160765/1
and CRSII2_141962). K.W. acknowledges support by the Narodowe Centrum Nauki Projects
2016/22/E/ST3/00560 and 2016/23/B/ST3/00839. E.M.P. and M.N. acknowledge funding
from the European Union’s Horizon 2020 research and innovation programme under the
Marie Sklodowska-Curie Grant Agreements 754411 and 701647, respectively. M.R. was
supported by the Swiss National Science Foundation under Project 200021 – 182695.
This research used resources of the APS, a U.S. Department of Energy (DOE) Office
of Science User Facility operated for the DOE Office of Science by Argonne National
Laboratory under Contract DE-AC02-06CH11357.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Eugenio
full_name: Paris, Eugenio
last_name: Paris
- first_name: Yi
full_name: Tseng, Yi
last_name: Tseng
- first_name: Ekaterina
full_name: Paerschke, Ekaterina
id: 8275014E-6063-11E9-9B7F-6338E6697425
last_name: Paerschke
orcid: 0000-0003-0853-8182
- first_name: Wenliang
full_name: Zhang, Wenliang
last_name: Zhang
- first_name: Mary H
full_name: Upton, Mary H
last_name: Upton
- first_name: Anna
full_name: Efimenko, Anna
last_name: Efimenko
- first_name: Katharina
full_name: Rolfs, Katharina
last_name: Rolfs
- first_name: Daniel E
full_name: McNally, Daniel E
last_name: McNally
- first_name: Laura
full_name: Maurel, Laura
last_name: Maurel
- first_name: Muntaser
full_name: Naamneh, Muntaser
last_name: Naamneh
- first_name: Marco
full_name: Caputo, Marco
last_name: Caputo
- first_name: Vladimir N
full_name: Strocov, Vladimir N
last_name: Strocov
- first_name: Zhiming
full_name: Wang, Zhiming
last_name: Wang
- first_name: Diego
full_name: Casa, Diego
last_name: Casa
- first_name: Christof W
full_name: Schneider, Christof W
last_name: Schneider
- first_name: Ekaterina
full_name: Pomjakushina, Ekaterina
last_name: Pomjakushina
- first_name: Krzysztof
full_name: Wohlfeld, Krzysztof
last_name: Wohlfeld
- first_name: Milan
full_name: Radovic, Milan
last_name: Radovic
- first_name: Thorsten
full_name: Schmitt, Thorsten
last_name: Schmitt
citation:
ama: Paris E, Tseng Y, Paerschke E, et al. Strain engineering of the charge and
spin-orbital interactions in Sr2IrO4. Proceedings of the National Academy of
Sciences of the United States of America. 2020;117(40):24764-24770. doi:10.1073/pnas.2012043117
apa: Paris, E., Tseng, Y., Paerschke, E., Zhang, W., Upton, M. H., Efimenko, A.,
… Schmitt, T. (2020). Strain engineering of the charge and spin-orbital interactions
in Sr2IrO4. Proceedings of the National Academy of Sciences of the United States
of America. National Academy of Sciences. https://doi.org/10.1073/pnas.2012043117
chicago: Paris, Eugenio, Yi Tseng, Ekaterina Paerschke, Wenliang Zhang, Mary H Upton,
Anna Efimenko, Katharina Rolfs, et al. “Strain Engineering of the Charge and Spin-Orbital
Interactions in Sr2IrO4.” Proceedings of the National Academy of Sciences of
the United States of America. National Academy of Sciences, 2020. https://doi.org/10.1073/pnas.2012043117.
ieee: E. Paris et al., “Strain engineering of the charge and spin-orbital
interactions in Sr2IrO4,” Proceedings of the National Academy of Sciences of
the United States of America, vol. 117, no. 40. National Academy of Sciences,
pp. 24764–24770, 2020.
ista: Paris E, Tseng Y, Paerschke E, Zhang W, Upton MH, Efimenko A, Rolfs K, McNally
DE, Maurel L, Naamneh M, Caputo M, Strocov VN, Wang Z, Casa D, Schneider CW, Pomjakushina
E, Wohlfeld K, Radovic M, Schmitt T. 2020. Strain engineering of the charge and
spin-orbital interactions in Sr2IrO4. Proceedings of the National Academy of Sciences
of the United States of America. 117(40), 24764–24770.
mla: Paris, Eugenio, et al. “Strain Engineering of the Charge and Spin-Orbital Interactions
in Sr2IrO4.” Proceedings of the National Academy of Sciences of the United
States of America, vol. 117, no. 40, National Academy of Sciences, 2020, pp.
24764–70, doi:10.1073/pnas.2012043117.
short: E. Paris, Y. Tseng, E. Paerschke, W. Zhang, M.H. Upton, A. Efimenko, K. Rolfs,
D.E. McNally, L. Maurel, M. Naamneh, M. Caputo, V.N. Strocov, Z. Wang, D. Casa,
C.W. Schneider, E. Pomjakushina, K. Wohlfeld, M. Radovic, T. Schmitt, Proceedings
of the National Academy of Sciences of the United States of America 117 (2020)
24764–24770.
date_created: 2020-10-25T23:01:17Z
date_published: 2020-10-06T00:00:00Z
date_updated: 2023-08-22T12:11:52Z
day: '06'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1073/pnas.2012043117
ec_funded: 1
external_id:
arxiv:
- '2009.12262'
isi:
- '000579059100029'
pmid:
- '32958669'
file:
- access_level: open_access
checksum: 1638fa36b442e2868576c6dd7d6dc505
content_type: application/pdf
creator: cziletti
date_created: 2020-10-28T11:53:12Z
date_updated: 2020-10-28T11:53:12Z
file_id: '8715'
file_name: 2020_PNAS_Paris.pdf
file_size: 1176522
relation: main_file
success: 1
file_date_updated: 2020-10-28T11:53:12Z
has_accepted_license: '1'
intvolume: ' 117'
isi: 1
issue: '40'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
page: 24764-24770
pmid: 1
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Proceedings of the National Academy of Sciences of the United States
of America
publication_identifier:
eissn:
- '10916490'
issn:
- '00278424'
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Strain engineering of the charge and spin-orbital interactions in Sr2IrO4
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 117
year: '2020'
...
---
_id: '8726'
abstract:
- lang: eng
text: Several realistic spin-orbital models for transition metal oxides go beyond
the classical expectations and could be understood only by employing the quantum
entanglement. Experiments on these materials confirm that spin-orbital entanglement
has measurable consequences. Here, we capture the essential features of spin-orbital
entanglement in complex quantum matter utilizing 1D spin-orbital model which accommodates
SU(2)⊗SU(2) symmetric Kugel-Khomskii superexchange as well as the Ising on-site
spin-orbit coupling. Building on the results obtained for full and effective models
in the regime of strong spin-orbit coupling, we address the question whether the
entanglement found on superexchange bonds always increases when the Ising spin-orbit
coupling is added. We show that (i) quantum entanglement is amplified by strong
spin-orbit coupling and, surprisingly, (ii) almost classical disentangled states
are possible. We complete the latter case by analyzing how the entanglement existing
for intermediate values of spin-orbit coupling can disappear for higher values
of this coupling.
article_number: '53'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Dorota
full_name: Gotfryd, Dorota
last_name: Gotfryd
- first_name: Ekaterina
full_name: Paerschke, Ekaterina
id: 8275014E-6063-11E9-9B7F-6338E6697425
last_name: Paerschke
orcid: 0000-0003-0853-8182
- first_name: Krzysztof
full_name: Wohlfeld, Krzysztof
last_name: Wohlfeld
- first_name: Andrzej M.
full_name: Oleś, Andrzej M.
last_name: Oleś
citation:
ama: Gotfryd D, Paerschke E, Wohlfeld K, Oleś AM. Evolution of spin-orbital entanglement
with increasing ising spin-orbit coupling. Condensed Matter. 2020;5(3).
doi:10.3390/condmat5030053
apa: Gotfryd, D., Paerschke, E., Wohlfeld, K., & Oleś, A. M. (2020). Evolution
of spin-orbital entanglement with increasing ising spin-orbit coupling. Condensed
Matter. MDPI. https://doi.org/10.3390/condmat5030053
chicago: Gotfryd, Dorota, Ekaterina Paerschke, Krzysztof Wohlfeld, and Andrzej M.
Oleś. “Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit
Coupling.” Condensed Matter. MDPI, 2020. https://doi.org/10.3390/condmat5030053.
ieee: D. Gotfryd, E. Paerschke, K. Wohlfeld, and A. M. Oleś, “Evolution of spin-orbital
entanglement with increasing ising spin-orbit coupling,” Condensed Matter,
vol. 5, no. 3. MDPI, 2020.
ista: Gotfryd D, Paerschke E, Wohlfeld K, Oleś AM. 2020. Evolution of spin-orbital
entanglement with increasing ising spin-orbit coupling. Condensed Matter. 5(3),
53.
mla: Gotfryd, Dorota, et al. “Evolution of Spin-Orbital Entanglement with Increasing
Ising Spin-Orbit Coupling.” Condensed Matter, vol. 5, no. 3, 53, MDPI,
2020, doi:10.3390/condmat5030053.
short: D. Gotfryd, E. Paerschke, K. Wohlfeld, A.M. Oleś, Condensed Matter 5 (2020).
date_created: 2020-11-06T07:21:00Z
date_published: 2020-08-26T00:00:00Z
date_updated: 2021-01-12T08:20:46Z
day: '26'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.3390/condmat5030053
ec_funded: 1
external_id:
arxiv:
- '2009.11773'
file:
- access_level: open_access
checksum: a57a698ff99a11b6665bafd1bac7afbc
content_type: application/pdf
creator: dernst
date_created: 2020-11-06T07:24:40Z
date_updated: 2020-11-06T07:24:40Z
file_id: '8727'
file_name: 2020_CondensedMatter_Gotfryd.pdf
file_size: 768336
relation: main_file
success: 1
file_date_updated: 2020-11-06T07:24:40Z
has_accepted_license: '1'
intvolume: ' 5'
issue: '3'
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Condensed Matter
publication_identifier:
issn:
- 2410-3896
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: Evolution of spin-orbital entanglement with increasing ising spin-orbit coupling
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2020'
...
---
_id: '7594'
abstract:
- lang: eng
text: The concept of the entanglement between spin and orbital degrees of freedom
plays a crucial role in our understanding of various phases and exotic ground
states in a broad class of materials, including orbitally ordered materials and
spin liquids. We investigate how the spin-orbital entanglement in a Mott insulator
depends on the value of the spin-orbit coupling of the relativistic origin. To
this end, we numerically diagonalize a one-dimensional spin-orbital model with
Kugel-Khomskii exchange interactions between spins and orbitals on different sites
supplemented by the on-site spin-orbit coupling. In the regime of small spin-orbit
coupling with regard to the spin-orbital exchange, the ground state to a large
extent resembles the one obtained in the limit of vanishing spin-orbit coupling.
On the other hand, for large spin-orbit coupling the ground state can, depending
on the model parameters, either still show negligible spin-orbital entanglement
or evolve to a highly spin-orbitally-entangled phase with completely distinct
properties that are described by an effective XXZ model. The presented results
suggest that (i) the spin-orbital entanglement may be induced by large on-site
spin-orbit coupling, as found in the 5d transition metal oxides, such as the iridates;
(ii) for Mott insulators with weak spin-orbit coupling of Ising type, such as,
e.g., the alkali hyperoxides, the effects of the spin-orbit coupling on the ground
state can, in the first order of perturbation theory, be neglected.
article_number: '013353'
article_processing_charge: No
article_type: original
author:
- first_name: Dorota
full_name: Gotfryd, Dorota
last_name: Gotfryd
- first_name: Ekaterina
full_name: Paerschke, Ekaterina
id: 8275014E-6063-11E9-9B7F-6338E6697425
last_name: Paerschke
orcid: 0000-0003-0853-8182
- first_name: Jiri
full_name: Chaloupka, Jiri
last_name: Chaloupka
- first_name: Andrzej M.
full_name: Oles, Andrzej M.
last_name: Oles
- first_name: Krzysztof
full_name: Wohlfeld, Krzysztof
last_name: Wohlfeld
citation:
ama: Gotfryd D, Paerschke E, Chaloupka J, Oles AM, Wohlfeld K. How spin-orbital
entanglement depends on the spin-orbit coupling in a Mott insulator. Physical
Review Research. 2020;2(1). doi:10.1103/PhysRevResearch.2.013353
apa: Gotfryd, D., Paerschke, E., Chaloupka, J., Oles, A. M., & Wohlfeld, K.
(2020). How spin-orbital entanglement depends on the spin-orbit coupling in a
Mott insulator. Physical Review Research. American Physical Society. https://doi.org/10.1103/PhysRevResearch.2.013353
chicago: Gotfryd, Dorota, Ekaterina Paerschke, Jiri Chaloupka, Andrzej M. Oles,
and Krzysztof Wohlfeld. “How Spin-Orbital Entanglement Depends on the Spin-Orbit
Coupling in a Mott Insulator.” Physical Review Research. American Physical
Society, 2020. https://doi.org/10.1103/PhysRevResearch.2.013353.
ieee: D. Gotfryd, E. Paerschke, J. Chaloupka, A. M. Oles, and K. Wohlfeld, “How
spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator,”
Physical Review Research, vol. 2, no. 1. American Physical Society, 2020.
ista: Gotfryd D, Paerschke E, Chaloupka J, Oles AM, Wohlfeld K. 2020. How spin-orbital
entanglement depends on the spin-orbit coupling in a Mott insulator. Physical
Review Research. 2(1), 013353.
mla: Gotfryd, Dorota, et al. “How Spin-Orbital Entanglement Depends on the Spin-Orbit
Coupling in a Mott Insulator.” Physical Review Research, vol. 2, no. 1,
013353, American Physical Society, 2020, doi:10.1103/PhysRevResearch.2.013353.
short: D. Gotfryd, E. Paerschke, J. Chaloupka, A.M. Oles, K. Wohlfeld, Physical
Review Research 2 (2020).
date_created: 2020-03-20T15:21:10Z
date_published: 2020-03-20T00:00:00Z
date_updated: 2021-01-12T08:14:23Z
day: '20'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1103/PhysRevResearch.2.013353
ec_funded: 1
file:
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checksum: 1be551fd5f5583635076017d7391ffdc
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creator: dernst
date_created: 2020-03-23T10:18:38Z
date_updated: 2020-07-14T12:48:00Z
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file_name: 2020_PhysRevResearch_Gotfryd.pdf
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file_date_updated: 2020-07-14T12:48:00Z
has_accepted_license: '1'
intvolume: ' 2'
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language:
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month: '03'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review Research
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: How spin-orbital entanglement depends on the spin-orbit coupling in a Mott
insulator
tmp:
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legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
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type: journal_article
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...