---
_id: '13275'
abstract:
- lang: eng
text: We introduce a generic and accessible implementation of an exact diagonalization
method for studying few-fermion models. Our aim is to provide a testbed for the
newcomers to the field as well as a stepping stone for trying out novel optimizations
and approximations. This userguide consists of a description of the algorithm,
and several examples in varying orders of sophistication. In particular, we exemplify
our routine using an effective-interaction approach that fixes the low-energy
physics. We benchmark this approach against the existing data, and show that it
is able to deliver state-of-the-art numerical results at a significantly reduced
computational cost.
article_processing_charge: No
author:
- first_name: Lukas
full_name: Rammelmüller, Lukas
last_name: Rammelmüller
- first_name: David
full_name: Huber, David
last_name: Huber
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
citation:
ama: Rammelmüller L, Huber D, Volosniev A. Codebase release 1.0 for FermiFCI. 2023.
doi:10.21468/scipostphyscodeb.12-r1.0
apa: Rammelmüller, L., Huber, D., & Volosniev, A. (2023). Codebase release 1.0
for FermiFCI. SciPost Foundation. https://doi.org/10.21468/scipostphyscodeb.12-r1.0
chicago: Rammelmüller, Lukas, David Huber, and Artem Volosniev. “Codebase Release
1.0 for FermiFCI.” SciPost Foundation, 2023. https://doi.org/10.21468/scipostphyscodeb.12-r1.0.
ieee: L. Rammelmüller, D. Huber, and A. Volosniev, “Codebase release 1.0 for FermiFCI.”
SciPost Foundation, 2023.
ista: Rammelmüller L, Huber D, Volosniev A. 2023. Codebase release 1.0 for FermiFCI,
SciPost Foundation, 10.21468/scipostphyscodeb.12-r1.0.
mla: Rammelmüller, Lukas, et al. Codebase Release 1.0 for FermiFCI. SciPost
Foundation, 2023, doi:10.21468/scipostphyscodeb.12-r1.0.
short: L. Rammelmüller, D. Huber, A. Volosniev, (2023).
date_created: 2023-07-24T10:46:23Z
date_published: 2023-04-19T00:00:00Z
date_updated: 2023-07-31T09:16:02Z
day: '19'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.21468/scipostphyscodeb.12-r1.0
ec_funded: 1
main_file_link:
- open_access: '1'
url: https://doi.org/10.21468/SciPostPhysCodeb.12-r1.0
month: '04'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publisher: SciPost Foundation
related_material:
record:
- id: '13276'
relation: used_in_publication
status: public
status: public
title: Codebase release 1.0 for FermiFCI
type: research_data_reference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2023'
...
---
_id: '12723'
abstract:
- lang: eng
text: 'Lead halide perovskites enjoy a number of remarkable optoelectronic properties.
To explain their origin, it is necessary to study how electromagnetic fields interact
with these systems. We address this problem here by studying two classical quantities:
Faraday rotation and the complex refractive index in a paradigmatic perovskite
CH3NH3PbBr3 in a broad wavelength range. We find that the minimal coupling of
electromagnetic fields to the k⋅p Hamiltonian is insufficient to describe the
observed data even on the qualitative level. To amend this, we demonstrate that
there exists a relevant atomic-level coupling between electromagnetic fields and
the spin degree of freedom. This spin-electric coupling allows for quantitative
description of a number of previous as well as present experimental data. In particular,
we use it here to show that the Faraday effect in lead halide perovskites is dominated
by the Zeeman splitting of the energy levels and has a substantial beyond-Becquerel
contribution. Finally, we present general symmetry-based phenomenological arguments
that in the low-energy limit our effective model includes all basis coupling terms
to the electromagnetic field in the linear order.'
article_number: '106901'
article_processing_charge: No
article_type: original
author:
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
- first_name: Abhishek
full_name: Shiva Kumar, Abhishek
id: 5e9a6931-eb97-11eb-a6c2-e96f7058d77a
last_name: Shiva Kumar
- first_name: Dusan
full_name: Lorenc, Dusan
id: 40D8A3E6-F248-11E8-B48F-1D18A9856A87
last_name: Lorenc
- first_name: Younes
full_name: Ashourishokri, Younes
id: e32c111f-f6e0-11ea-865d-eb955baea334
last_name: Ashourishokri
- first_name: Ayan A.
full_name: Zhumekenov, Ayan A.
last_name: Zhumekenov
- first_name: Osman M.
full_name: Bakr, Osman M.
last_name: Bakr
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Zhanybek
full_name: Alpichshev, Zhanybek
id: 45E67A2A-F248-11E8-B48F-1D18A9856A87
last_name: Alpichshev
orcid: 0000-0002-7183-5203
citation:
ama: Volosniev A, Shiva Kumar A, Lorenc D, et al. Spin-electric coupling in lead
halide perovskites. Physical Review Letters. 2023;130(10). doi:10.1103/physrevlett.130.106901
apa: Volosniev, A., Shiva Kumar, A., Lorenc, D., Ashourishokri, Y., Zhumekenov,
A. A., Bakr, O. M., … Alpichshev, Z. (2023). Spin-electric coupling in lead halide
perovskites. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.130.106901
chicago: Volosniev, Artem, Abhishek Shiva Kumar, Dusan Lorenc, Younes Ashourishokri,
Ayan A. Zhumekenov, Osman M. Bakr, Mikhail Lemeshko, and Zhanybek Alpichshev.
“Spin-Electric Coupling in Lead Halide Perovskites.” Physical Review Letters.
American Physical Society, 2023. https://doi.org/10.1103/physrevlett.130.106901.
ieee: A. Volosniev et al., “Spin-electric coupling in lead halide perovskites,”
Physical Review Letters, vol. 130, no. 10. American Physical Society, 2023.
ista: Volosniev A, Shiva Kumar A, Lorenc D, Ashourishokri Y, Zhumekenov AA, Bakr
OM, Lemeshko M, Alpichshev Z. 2023. Spin-electric coupling in lead halide perovskites.
Physical Review Letters. 130(10), 106901.
mla: Volosniev, Artem, et al. “Spin-Electric Coupling in Lead Halide Perovskites.”
Physical Review Letters, vol. 130, no. 10, 106901, American Physical Society,
2023, doi:10.1103/physrevlett.130.106901.
short: A. Volosniev, A. Shiva Kumar, D. Lorenc, Y. Ashourishokri, A.A. Zhumekenov,
O.M. Bakr, M. Lemeshko, Z. Alpichshev, Physical Review Letters 130 (2023).
date_created: 2023-03-14T13:11:59Z
date_published: 2023-03-10T00:00:00Z
date_updated: 2023-08-01T13:39:04Z
day: '10'
department:
- _id: GradSch
- _id: ZhAl
- _id: MiLe
doi: 10.1103/physrevlett.130.106901
external_id:
arxiv:
- '2203.09443'
isi:
- '000982435900002'
intvolume: ' 130'
isi: 1
issue: '10'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2203.09443
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Spin-electric coupling in lead halide perovskites
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 130
year: '2023'
...
---
_id: '12724'
abstract:
- lang: eng
text: 'We use general symmetry-based arguments to construct an effective model suitable
for studying optical properties of lead halide perovskites. To build the model,
we identify an atomic-level interaction between electromagnetic fields and the
spin degree of freedom that should be added to a minimally coupled k⋅p Hamiltonian.
As a first application, we study two basic optical characteristics of the material:
the Verdet constant and the refractive index. Beyond these linear characteristics
of the material, the model is suitable for calculating nonlinear effects such
as the third-order optical susceptibility. Analysis of this quantity shows that
the geometrical properties of the spin-electric term imply isotropic optical response
of the system, and that optical anisotropy of lead halide perovskites is a manifestation
of hopping of charge carriers. To illustrate this, we discuss third-harmonic generation.'
article_number: '125201'
article_processing_charge: No
article_type: original
author:
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
- first_name: Abhishek
full_name: Shiva Kumar, Abhishek
id: 5e9a6931-eb97-11eb-a6c2-e96f7058d77a
last_name: Shiva Kumar
- first_name: Dusan
full_name: Lorenc, Dusan
id: 40D8A3E6-F248-11E8-B48F-1D18A9856A87
last_name: Lorenc
- first_name: Younes
full_name: Ashourishokri, Younes
id: e32c111f-f6e0-11ea-865d-eb955baea334
last_name: Ashourishokri
- first_name: Ayan
full_name: Zhumekenov, Ayan
last_name: Zhumekenov
- first_name: Osman M.
full_name: Bakr, Osman M.
last_name: Bakr
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Zhanybek
full_name: Alpichshev, Zhanybek
id: 45E67A2A-F248-11E8-B48F-1D18A9856A87
last_name: Alpichshev
orcid: 0000-0002-7183-5203
citation:
ama: Volosniev A, Shiva Kumar A, Lorenc D, et al. Effective model for studying optical
properties of lead halide perovskites. Physical Review B. 2023;107(12).
doi:10.1103/physrevb.107.125201
apa: Volosniev, A., Shiva Kumar, A., Lorenc, D., Ashourishokri, Y., Zhumekenov,
A., Bakr, O. M., … Alpichshev, Z. (2023). Effective model for studying optical
properties of lead halide perovskites. Physical Review B. American Physical
Society. https://doi.org/10.1103/physrevb.107.125201
chicago: Volosniev, Artem, Abhishek Shiva Kumar, Dusan Lorenc, Younes Ashourishokri,
Ayan Zhumekenov, Osman M. Bakr, Mikhail Lemeshko, and Zhanybek Alpichshev. “Effective
Model for Studying Optical Properties of Lead Halide Perovskites.” Physical
Review B. American Physical Society, 2023. https://doi.org/10.1103/physrevb.107.125201.
ieee: A. Volosniev et al., “Effective model for studying optical properties
of lead halide perovskites,” Physical Review B, vol. 107, no. 12. American
Physical Society, 2023.
ista: Volosniev A, Shiva Kumar A, Lorenc D, Ashourishokri Y, Zhumekenov A, Bakr
OM, Lemeshko M, Alpichshev Z. 2023. Effective model for studying optical properties
of lead halide perovskites. Physical Review B. 107(12), 125201.
mla: Volosniev, Artem, et al. “Effective Model for Studying Optical Properties of
Lead Halide Perovskites.” Physical Review B, vol. 107, no. 12, 125201,
American Physical Society, 2023, doi:10.1103/physrevb.107.125201.
short: A. Volosniev, A. Shiva Kumar, D. Lorenc, Y. Ashourishokri, A. Zhumekenov,
O.M. Bakr, M. Lemeshko, Z. Alpichshev, Physical Review B 107 (2023).
date_created: 2023-03-14T13:13:05Z
date_published: 2023-03-15T00:00:00Z
date_updated: 2023-08-01T13:39:47Z
day: '15'
department:
- _id: GradSch
- _id: ZhAl
- _id: MiLe
doi: 10.1103/physrevb.107.125201
external_id:
arxiv:
- '2204.04022'
isi:
- '000972602200006'
intvolume: ' 107'
isi: 1
issue: '12'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2204.04022
month: '03'
oa: 1
oa_version: Preprint
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: Effective model for studying optical properties of lead halide perovskites
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '12788'
abstract:
- lang: eng
text: We show that the simplest of existing molecules—closed-shell diatomics not
interacting with one another—host topological charges when driven by periodic
far-off-resonant laser pulses. A periodically kicked molecular rotor can be mapped
onto a “crystalline” lattice in angular momentum space. This allows us to define
quasimomenta and the band structure in the Floquet representation, by analogy
with the Bloch waves of solid-state physics. Applying laser pulses spaced by 1/3
of the molecular rotational period creates a lattice with three atoms per unit
cell with staggered hopping. Within the synthetic dimension of the laser strength,
we discover Dirac cones with topological charges. These Dirac cones, topologically
protected by reflection and time-reversal symmetry, are reminiscent of (although
not equivalent to) that seen in graphene. They—and the corresponding edge states—are
broadly tunable by adjusting the laser strength and can be observed in present-day
experiments by measuring molecular alignment and populations of rotational levels.
This paves the way to study controllable topological physics in gas-phase experiments
with small molecules as well as to classify dynamical molecular states by their
topological invariants.
acknowledgement: M. L. acknowledges support by the European Research Council (ERC)
Starting Grant No. 801770 (ANGULON).
article_number: '103202'
article_processing_charge: No
article_type: original
author:
- first_name: Volker
full_name: Karle, Volker
id: D7C012AE-D7ED-11E9-95E8-1EC5E5697425
last_name: Karle
- first_name: Areg
full_name: Ghazaryan, Areg
id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
last_name: Ghazaryan
orcid: 0000-0001-9666-3543
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Karle V, Ghazaryan A, Lemeshko M. Topological charges of periodically kicked
molecules. Physical Review Letters. 2023;130(10). doi:10.1103/PhysRevLett.130.103202
apa: Karle, V., Ghazaryan, A., & Lemeshko, M. (2023). Topological charges of
periodically kicked molecules. Physical Review Letters. American Physical
Society. https://doi.org/10.1103/PhysRevLett.130.103202
chicago: Karle, Volker, Areg Ghazaryan, and Mikhail Lemeshko. “Topological Charges
of Periodically Kicked Molecules.” Physical Review Letters. American Physical
Society, 2023. https://doi.org/10.1103/PhysRevLett.130.103202.
ieee: V. Karle, A. Ghazaryan, and M. Lemeshko, “Topological charges of periodically
kicked molecules,” Physical Review Letters, vol. 130, no. 10. American
Physical Society, 2023.
ista: Karle V, Ghazaryan A, Lemeshko M. 2023. Topological charges of periodically
kicked molecules. Physical Review Letters. 130(10), 103202.
mla: Karle, Volker, et al. “Topological Charges of Periodically Kicked Molecules.”
Physical Review Letters, vol. 130, no. 10, 103202, American Physical Society,
2023, doi:10.1103/PhysRevLett.130.103202.
short: V. Karle, A. Ghazaryan, M. Lemeshko, Physical Review Letters 130 (2023).
date_created: 2023-04-02T22:01:10Z
date_published: 2023-03-10T00:00:00Z
date_updated: 2023-08-01T14:02:06Z
day: '10'
department:
- _id: MiLe
doi: 10.1103/PhysRevLett.130.103202
ec_funded: 1
external_id:
arxiv:
- '2206.07067'
isi:
- '000957635500003'
intvolume: ' 130'
isi: 1
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2206.07067
month: '03'
oa: 1
oa_version: Preprint
project:
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News on the ISTA website
relation: press_release
url: https://ista.ac.at/en/news/topology-of-rotating-molecules/
scopus_import: '1'
status: public
title: Topological charges of periodically kicked molecules
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 130
year: '2023'
...
---
_id: '12790'
abstract:
- lang: eng
text: Motivated by the recent discoveries of superconductivity in bilayer and trilayer
graphene, we theoretically investigate superconductivity and other interaction-driven
phases in multilayer graphene stacks. To this end, we study the density of states
of multilayer graphene with up to four layers at the single-particle band structure
level in the presence of a transverse electric field. Among the considered structures,
tetralayer graphene with rhombohedral (ABCA) stacking reaches the highest density
of states. We study the phases that can arise in ABCA graphene by tuning the carrier
density and transverse electric field. For a broad region of the tuning parameters,
the presence of strong Coulomb repulsion leads to a spontaneous spin and valley
symmetry breaking via Stoner transitions. Using a model that incorporates the
spontaneous spin and valley polarization, we explore the Kohn-Luttinger mechanism
for superconductivity driven by repulsive Coulomb interactions. We find that the
strongest superconducting instability is in the p-wave channel, and occurs in
proximity to the onset of Stoner transitions. Interestingly, we find a range of
densities and transverse electric fields where superconductivity develops out
of a strongly corrugated, singly connected Fermi surface in each valley, leading
to a topologically nontrivial chiral p+ip superconducting state with an even number
of copropagating chiral Majorana edge modes. Our work establishes ABCA-stacked
tetralayer graphene as a promising platform for observing strongly correlated
physics and topological superconductivity.
acknowledgement: E.B. and T.H. were supported by the European Research Council (ERC)
under grant HQMAT (Grant Agreement No. 817799), by the Israel-USA Binational Science
Foundation (BSF), and by a Research grant from Irving and Cherna Moskowitz.
article_number: '104502'
article_processing_charge: No
article_type: original
author:
- first_name: Areg
full_name: Ghazaryan, Areg
id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
last_name: Ghazaryan
orcid: 0000-0001-9666-3543
- first_name: Tobias
full_name: Holder, Tobias
last_name: Holder
- first_name: Erez
full_name: Berg, Erez
last_name: Berg
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Ghazaryan A, Holder T, Berg E, Serbyn M. Multilayer graphenes as a platform
for interaction-driven physics and topological superconductivity. Physical
Review B. 2023;107(10). doi:10.1103/PhysRevB.107.104502
apa: Ghazaryan, A., Holder, T., Berg, E., & Serbyn, M. (2023). Multilayer graphenes
as a platform for interaction-driven physics and topological superconductivity.
Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.107.104502
chicago: Ghazaryan, Areg, Tobias Holder, Erez Berg, and Maksym Serbyn. “Multilayer
Graphenes as a Platform for Interaction-Driven Physics and Topological Superconductivity.”
Physical Review B. American Physical Society, 2023. https://doi.org/10.1103/PhysRevB.107.104502.
ieee: A. Ghazaryan, T. Holder, E. Berg, and M. Serbyn, “Multilayer graphenes as
a platform for interaction-driven physics and topological superconductivity,”
Physical Review B, vol. 107, no. 10. American Physical Society, 2023.
ista: Ghazaryan A, Holder T, Berg E, Serbyn M. 2023. Multilayer graphenes as a platform
for interaction-driven physics and topological superconductivity. Physical Review
B. 107(10), 104502.
mla: Ghazaryan, Areg, et al. “Multilayer Graphenes as a Platform for Interaction-Driven
Physics and Topological Superconductivity.” Physical Review B, vol. 107,
no. 10, 104502, American Physical Society, 2023, doi:10.1103/PhysRevB.107.104502.
short: A. Ghazaryan, T. Holder, E. Berg, M. Serbyn, Physical Review B 107 (2023).
date_created: 2023-04-02T22:01:10Z
date_published: 2023-03-01T00:00:00Z
date_updated: 2023-08-01T13:59:29Z
day: '01'
department:
- _id: MaSe
- _id: MiLe
doi: 10.1103/PhysRevB.107.104502
external_id:
arxiv:
- '2211.02492'
isi:
- '000945526400003'
intvolume: ' 107'
isi: 1
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2211.02492
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News on the ISTA website
relation: press_release
url: https://ista.ac.at/en/news/reaching-superconductivity-layer-by-layer/
scopus_import: '1'
status: public
title: Multilayer graphenes as a platform for interaction-driven physics and topological
superconductivity
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...