---
_id: '5983'
abstract:
- lang: eng
  text: We study a quantum impurity possessing both translational and internal rotational
    degrees of freedom interacting with a bosonic bath. Such a system corresponds
    to a “rotating polaron,” which can be used to model, e.g., a rotating molecule
    immersed in an ultracold Bose gas or superfluid helium. We derive the Hamiltonian
    of the rotating polaron and study its spectrum in the weak- and strong-coupling
    regimes using a combination of variational, diagrammatic, and mean-field approaches.
    We reveal how the coupling between linear and angular momenta affects stable quasiparticle
    states, and demonstrate that internal rotation leads to an enhanced self-localization
    in the translational degrees of freedom.
article_number: '224506'
article_processing_charge: No
arxiv: 1
author:
- first_name: Enderalp
  full_name: Yakaboylu, Enderalp
  id: 38CB71F6-F248-11E8-B48F-1D18A9856A87
  last_name: Yakaboylu
  orcid: 0000-0001-5973-0874
- first_name: Bikashkali
  full_name: Midya, Bikashkali
  id: 456187FC-F248-11E8-B48F-1D18A9856A87
  last_name: Midya
- first_name: Andreas
  full_name: Deuchert, Andreas
  id: 4DA65CD0-F248-11E8-B48F-1D18A9856A87
  last_name: Deuchert
  orcid: 0000-0003-3146-6746
- first_name: Nikolai K
  full_name: Leopold, Nikolai K
  id: 4BC40BEC-F248-11E8-B48F-1D18A9856A87
  last_name: Leopold
  orcid: 0000-0002-0495-6822
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: 'Yakaboylu E, Midya B, Deuchert A, Leopold NK, Lemeshko M. Theory of the rotating
    polaron: Spectrum and self-localization. <i>Physical Review B</i>. 2018;98(22).
    doi:<a href="https://doi.org/10.1103/physrevb.98.224506">10.1103/physrevb.98.224506</a>'
  apa: 'Yakaboylu, E., Midya, B., Deuchert, A., Leopold, N. K., &#38; Lemeshko, M.
    (2018). Theory of the rotating polaron: Spectrum and self-localization. <i>Physical
    Review B</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevb.98.224506">https://doi.org/10.1103/physrevb.98.224506</a>'
  chicago: 'Yakaboylu, Enderalp, Bikashkali Midya, Andreas Deuchert, Nikolai K Leopold,
    and Mikhail Lemeshko. “Theory of the Rotating Polaron: Spectrum and Self-Localization.”
    <i>Physical Review B</i>. American Physical Society, 2018. <a href="https://doi.org/10.1103/physrevb.98.224506">https://doi.org/10.1103/physrevb.98.224506</a>.'
  ieee: 'E. Yakaboylu, B. Midya, A. Deuchert, N. K. Leopold, and M. Lemeshko, “Theory
    of the rotating polaron: Spectrum and self-localization,” <i>Physical Review B</i>,
    vol. 98, no. 22. American Physical Society, 2018.'
  ista: 'Yakaboylu E, Midya B, Deuchert A, Leopold NK, Lemeshko M. 2018. Theory of
    the rotating polaron: Spectrum and self-localization. Physical Review B. 98(22),
    224506.'
  mla: 'Yakaboylu, Enderalp, et al. “Theory of the Rotating Polaron: Spectrum and
    Self-Localization.” <i>Physical Review B</i>, vol. 98, no. 22, 224506, American
    Physical Society, 2018, doi:<a href="https://doi.org/10.1103/physrevb.98.224506">10.1103/physrevb.98.224506</a>.'
  short: E. Yakaboylu, B. Midya, A. Deuchert, N.K. Leopold, M. Lemeshko, Physical
    Review B 98 (2018).
date_created: 2019-02-14T10:37:09Z
date_published: 2018-12-12T00:00:00Z
date_updated: 2023-09-19T14:29:03Z
day: '12'
department:
- _id: MiLe
- _id: RoSe
doi: 10.1103/physrevb.98.224506
ec_funded: 1
external_id:
  arxiv:
  - '1809.01204'
  isi:
  - '000452992700008'
intvolume: '        98'
isi: 1
issue: '22'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1809.01204
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
- _id: 25C6DC12-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '694227'
  name: Analysis of quantum many-body systems
publication: Physical Review B
publication_identifier:
  eissn:
  - 2469-9969
  issn:
  - 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Theory of the rotating polaron: Spectrum and self-localization'
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 98
year: '2018'
...
---
_id: '435'
abstract:
- lang: eng
  text: It is shown that two fundamentally different phenomena, the bound states in
    continuum and the spectral singularity (or time-reversed spectral singularity),
    can occur simultaneously. This can be achieved in a rectangular core dielectric
    waveguide with an embedded active (or absorbing) layer. In such a system a two-dimensional
    bound state in a continuum is created in the plane of a waveguide cross section,
    and it is emitted or absorbed along the waveguide core. The idea can be used for
    experimental implementation of a laser or a coherent-perfect-absorber for a photonic
    bound state that resides in a continuous spectrum.
acknowledgement: 'Seventh Framework Programme (FP7) People: Marie-Curie Actions (PEOPLE)
  (291734). B. M. acknowledges the financial support by the People Programme (Marie
  Curie Actions) of the European Union’s Seventh Framework Programme (FP7/ 2007-2013)
  under REA.'
article_processing_charge: No
arxiv: 1
author:
- first_name: Bikashkali
  full_name: Midya, Bikashkali
  id: 456187FC-F248-11E8-B48F-1D18A9856A87
  last_name: Midya
- first_name: Vladimir
  full_name: Konotop, Vladimir
  last_name: Konotop
citation:
  ama: Midya B, Konotop V. Coherent-perfect-absorber and laser for bound states in
    a continuum. <i>Optics Letters</i>. 2018;43(3):607-610. doi:<a href="https://doi.org/10.1364/OL.43.000607">10.1364/OL.43.000607</a>
  apa: Midya, B., &#38; Konotop, V. (2018). Coherent-perfect-absorber and laser for
    bound states in a continuum. <i>Optics Letters</i>. Optica  Publishing Group.
    <a href="https://doi.org/10.1364/OL.43.000607">https://doi.org/10.1364/OL.43.000607</a>
  chicago: Midya, Bikashkali, and Vladimir Konotop. “Coherent-Perfect-Absorber and
    Laser for Bound States in a Continuum.” <i>Optics Letters</i>. Optica  Publishing
    Group, 2018. <a href="https://doi.org/10.1364/OL.43.000607">https://doi.org/10.1364/OL.43.000607</a>.
  ieee: B. Midya and V. Konotop, “Coherent-perfect-absorber and laser for bound states
    in a continuum,” <i>Optics Letters</i>, vol. 43, no. 3. Optica  Publishing Group,
    pp. 607–610, 2018.
  ista: Midya B, Konotop V. 2018. Coherent-perfect-absorber and laser for bound states
    in a continuum. Optics Letters. 43(3), 607–610.
  mla: Midya, Bikashkali, and Vladimir Konotop. “Coherent-Perfect-Absorber and Laser
    for Bound States in a Continuum.” <i>Optics Letters</i>, vol. 43, no. 3, Optica 
    Publishing Group, 2018, pp. 607–10, doi:<a href="https://doi.org/10.1364/OL.43.000607">10.1364/OL.43.000607</a>.
  short: B. Midya, V. Konotop, Optics Letters 43 (2018) 607–610.
date_created: 2018-12-11T11:46:27Z
date_published: 2018-02-01T00:00:00Z
date_updated: 2023-10-17T12:15:06Z
day: '01'
department:
- _id: MiLe
doi: 10.1364/OL.43.000607
ec_funded: 1
external_id:
  arxiv:
  - '1711.01986'
  isi:
  - '000423776600066'
intvolume: '        43'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1711.01986
month: '02'
oa: 1
oa_version: Preprint
page: 607 - 610
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Optics Letters
publication_status: published
publisher: Optica  Publishing Group
publist_id: '7388'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Coherent-perfect-absorber and laser for bound states in a continuum
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 43
year: '2018'
...
---
_id: '939'
abstract:
- lang: eng
  text: We reveal the existence of continuous families of guided single-mode solitons
    in planar waveguides with weakly nonlinear active core and absorbing boundaries.
    Stable propagation of TE and TM-polarized solitons is accompanied by attenuation
    of all other modes, i.e., the waveguide features properties of conservative and
    dissipative systems. If the linear spectrum of the waveguide possesses exceptional
    points, which occurs in the case of TM polarization, an originally focusing (defocusing)
    material nonlinearity may become effectively defocusing (focusing). This occurs
    due to the geometric phase of the carried eigenmode when the surface impedance
    encircles the exceptional point. In its turn, the change of the effective nonlinearity
    ensures the existence of dark (bright) solitons in spite of focusing (defocusing)
    Kerr nonlinearity of the core. The existence of an exceptional point can also
    result in anomalous enhancement of the effective nonlinearity. In terms of practical
    applications, the nonlinearity of the reported waveguide can be manipulated by
    controlling the properties of the absorbing cladding.
article_number: '033905'
article_processing_charge: No
author:
- first_name: Bikashkali
  full_name: Midya, Bikashkali
  id: 456187FC-F248-11E8-B48F-1D18A9856A87
  last_name: Midya
- first_name: Vladimir
  full_name: Konotop, Vladimir
  last_name: Konotop
citation:
  ama: 'Midya B, Konotop V. Waveguides with absorbing boundaries: Nonlinearity controlled
    by an exceptional point and solitons. <i>Physical Review Letters</i>. 2017;119(3).
    doi:<a href="https://doi.org/10.1103/PhysRevLett.119.033905">10.1103/PhysRevLett.119.033905</a>'
  apa: 'Midya, B., &#38; Konotop, V. (2017). Waveguides with absorbing boundaries:
    Nonlinearity controlled by an exceptional point and solitons. <i>Physical Review
    Letters</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevLett.119.033905">https://doi.org/10.1103/PhysRevLett.119.033905</a>'
  chicago: 'Midya, Bikashkali, and Vladimir Konotop. “Waveguides with Absorbing Boundaries:
    Nonlinearity Controlled by an Exceptional Point and Solitons.” <i>Physical Review
    Letters</i>. American Physical Society, 2017. <a href="https://doi.org/10.1103/PhysRevLett.119.033905">https://doi.org/10.1103/PhysRevLett.119.033905</a>.'
  ieee: 'B. Midya and V. Konotop, “Waveguides with absorbing boundaries: Nonlinearity
    controlled by an exceptional point and solitons,” <i>Physical Review Letters</i>,
    vol. 119, no. 3. American Physical Society, 2017.'
  ista: 'Midya B, Konotop V. 2017. Waveguides with absorbing boundaries: Nonlinearity
    controlled by an exceptional point and solitons. Physical Review Letters. 119(3),
    033905.'
  mla: 'Midya, Bikashkali, and Vladimir Konotop. “Waveguides with Absorbing Boundaries:
    Nonlinearity Controlled by an Exceptional Point and Solitons.” <i>Physical Review
    Letters</i>, vol. 119, no. 3, 033905, American Physical Society, 2017, doi:<a
    href="https://doi.org/10.1103/PhysRevLett.119.033905">10.1103/PhysRevLett.119.033905</a>.'
  short: B. Midya, V. Konotop, Physical Review Letters 119 (2017).
date_created: 2018-12-11T11:49:18Z
date_published: 2017-07-18T00:00:00Z
date_updated: 2023-09-26T15:39:46Z
day: '18'
department:
- _id: MiLe
doi: 10.1103/PhysRevLett.119.033905
ec_funded: 1
external_id:
  isi:
  - '000405718200012'
intvolume: '       119'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: 'https://arxiv.org/abs/1706.04085 '
month: '07'
oa: 1
oa_version: Submitted Version
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Physical Review Letters
publication_identifier:
  issn:
  - '00319007'
publication_status: published
publisher: American Physical Society
publist_id: '6481'
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Waveguides with absorbing boundaries: Nonlinearity controlled by an exceptional
  point and solitons'
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 119
year: '2017'
...
---
_id: '1286'
abstract:
- lang: eng
  text: We use recently developed angulon theory [R. Schmidt and M. Lemeshko, Phys.
    Rev. Lett. 114, 203001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.203001] to
    study the rotational spectrum of a cyanide molecular anion immersed into Bose-Einstein
    condensates of rubidium and strontium. Based on ab initio potential energy surfaces,
    we provide a detailed study of the rotational Lamb shift and many-body-induced
    fine structure which arise due to dressing of molecular rotation by a field of
    phonon excitations. We demonstrate that the magnitude of these effects is large
    enough in order to be observed in modern experiments on cold molecular ions. Furthermore,
    we introduce a novel method to construct pseudopotentials starting from the ab
    initio potential energy surfaces, which provides a means to obtain effective coupling
    constants for low-energy polaron models.
acknowledgement: The work was supported by the NSF through a grant for the Institute
  for Theoretical Atomic, Molecular, and Optical Physics at Harvard University and
  the Smithsonian Astrophysical Observatory. B.M. acknowledges financial support received
  from the People Programme (Marie Curie Actions) of the European Union's Seventh
  Framework Programme (FP7/2007-2013) under REA grant agreement No. 291734. M.T. acknowledges
  support from the EU Marie Curie COFUND action (ICFOnest), the EU Grants ERC AdG
  OSYRIS, FP7 SIQS and EQuaM, FETPROACT QUIC, the Spanish Ministry Grants FOQUS (FIS2013-46768-P)
  and Severo Ochoa (SEV-2015-0522), Generalitat de Catalunya (SGR 874), Fundacio Cellex,
  the National Science Centre (2015/19/D/ST4/02173), and the PL-Grid Infrastructure.
article_number: '041601'
author:
- first_name: Bikashkali
  full_name: Midya, Bikashkali
  id: 456187FC-F248-11E8-B48F-1D18A9856A87
  last_name: Midya
- first_name: Michał
  full_name: Tomza, Michał
  last_name: Tomza
- first_name: Richard
  full_name: Schmidt, Richard
  last_name: Schmidt
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: Midya B, Tomza M, Schmidt R, Lemeshko M. Rotation of cold molecular ions inside
    a Bose-Einstein condensate. <i>Physical Review A - Atomic, Molecular, and Optical
    Physics</i>. 2016;94(4). doi:<a href="https://doi.org/10.1103/PhysRevA.94.041601">10.1103/PhysRevA.94.041601</a>
  apa: Midya, B., Tomza, M., Schmidt, R., &#38; Lemeshko, M. (2016). Rotation of cold
    molecular ions inside a Bose-Einstein condensate. <i>Physical Review A - Atomic,
    Molecular, and Optical Physics</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.94.041601">https://doi.org/10.1103/PhysRevA.94.041601</a>
  chicago: Midya, Bikashkali, Michał Tomza, Richard Schmidt, and Mikhail Lemeshko.
    “Rotation of Cold Molecular Ions inside a Bose-Einstein Condensate.” <i>Physical
    Review A - Atomic, Molecular, and Optical Physics</i>. American Physical Society,
    2016. <a href="https://doi.org/10.1103/PhysRevA.94.041601">https://doi.org/10.1103/PhysRevA.94.041601</a>.
  ieee: B. Midya, M. Tomza, R. Schmidt, and M. Lemeshko, “Rotation of cold molecular
    ions inside a Bose-Einstein condensate,” <i>Physical Review A - Atomic, Molecular,
    and Optical Physics</i>, vol. 94, no. 4. American Physical Society, 2016.
  ista: Midya B, Tomza M, Schmidt R, Lemeshko M. 2016. Rotation of cold molecular
    ions inside a Bose-Einstein condensate. Physical Review A - Atomic, Molecular,
    and Optical Physics. 94(4), 041601.
  mla: Midya, Bikashkali, et al. “Rotation of Cold Molecular Ions inside a Bose-Einstein
    Condensate.” <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>,
    vol. 94, no. 4, 041601, American Physical Society, 2016, doi:<a href="https://doi.org/10.1103/PhysRevA.94.041601">10.1103/PhysRevA.94.041601</a>.
  short: B. Midya, M. Tomza, R. Schmidt, M. Lemeshko, Physical Review A - Atomic,
    Molecular, and Optical Physics 94 (2016).
date_created: 2018-12-11T11:51:09Z
date_published: 2016-10-13T00:00:00Z
date_updated: 2021-01-12T06:49:37Z
day: '13'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.94.041601
ec_funded: 1
intvolume: '        94'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1607.06092
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Physical Review A - Atomic, Molecular, and Optical Physics
publication_status: published
publisher: American Physical Society
publist_id: '6030'
quality_controlled: '1'
scopus_import: 1
status: public
title: Rotation of cold molecular ions inside a Bose-Einstein condensate
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 94
year: '2016'
...
---
_id: '1287'
abstract:
- lang: eng
  text: A planar waveguide with an impedance boundary, composed of nonperfect metallic
    plates, and with passive or active dielectric filling, is considered. We show
    the possibility of selective mode guiding and amplification when a homogeneous
    pump is added to the dielectric and analyze differences in TE and TM mode propagation.
    Such a non-conservative system is also shown to feature exceptional points for
    specific and experimentally tunable parameters, which are described for a particular
    case of transparent dielectric.
acknowledgement: The research of B.M. is supported by the People Programme (Marie
  Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013)
  under REA grant No. [291734].
article_processing_charge: No
author:
- first_name: Bikashkali
  full_name: Midya, Bikashkali
  id: 456187FC-F248-11E8-B48F-1D18A9856A87
  last_name: Midya
- first_name: Vladimir
  full_name: Konotop, Vladimir
  last_name: Konotop
citation:
  ama: Midya B, Konotop V. Modes and exceptional points in waveguides with impedance
    boundary conditions. <i>Optics Letters</i>. 2016;41(20):4621-4624. doi:<a href="https://doi.org/10.1364/OL.41.004621">10.1364/OL.41.004621</a>
  apa: Midya, B., &#38; Konotop, V. (2016). Modes and exceptional points in waveguides
    with impedance boundary conditions. <i>Optics Letters</i>. Optica Publishing Group.
    <a href="https://doi.org/10.1364/OL.41.004621">https://doi.org/10.1364/OL.41.004621</a>
  chicago: Midya, Bikashkali, and Vladimir Konotop. “Modes and Exceptional Points
    in Waveguides with Impedance Boundary Conditions.” <i>Optics Letters</i>. Optica
    Publishing Group, 2016. <a href="https://doi.org/10.1364/OL.41.004621">https://doi.org/10.1364/OL.41.004621</a>.
  ieee: B. Midya and V. Konotop, “Modes and exceptional points in waveguides with
    impedance boundary conditions,” <i>Optics Letters</i>, vol. 41, no. 20. Optica
    Publishing Group, pp. 4621–4624, 2016.
  ista: Midya B, Konotop V. 2016. Modes and exceptional points in waveguides with
    impedance boundary conditions. Optics Letters. 41(20), 4621–4624.
  mla: Midya, Bikashkali, and Vladimir Konotop. “Modes and Exceptional Points in Waveguides
    with Impedance Boundary Conditions.” <i>Optics Letters</i>, vol. 41, no. 20, Optica
    Publishing Group, 2016, pp. 4621–24, doi:<a href="https://doi.org/10.1364/OL.41.004621">10.1364/OL.41.004621</a>.
  short: B. Midya, V. Konotop, Optics Letters 41 (2016) 4621–4624.
date_created: 2018-12-11T11:51:09Z
date_published: 2016-10-15T00:00:00Z
date_updated: 2023-10-17T12:16:24Z
day: '15'
department:
- _id: MiLe
doi: 10.1364/OL.41.004621
ec_funded: 1
intvolume: '        41'
issue: '20'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1609.02863
month: '10'
oa: 1
oa_version: Preprint
page: 4621 - 4624
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Optics Letters
publication_status: published
publisher: Optica Publishing Group
publist_id: '6029'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Modes and exceptional points in waveguides with impedance boundary conditions
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 41
year: '2016'
...