---
_id: '8588'
abstract:
- lang: eng
text: Dipolar (or spatially indirect) excitons (IXs) in semiconductor double quantum
well (DQW) subjected to an electric field are neutral species with a dipole moment
oriented perpendicular to the DQW plane. Here, we theoretically study interactions
between IXs in stacked DQW bilayers, where the dipolar coupling can be either
attractive or repulsive depending on the relative positions of the particles.
By using microscopic band structure calculations to determine the electronic states
forming the excitons, we show that the attractive dipolar interaction between
stacked IXs deforms their electronic wave function, thereby increasing the inter-DQW
interaction energy and making the IX even more electrically polarizable. Many-particle
interaction effects are addressed by considering the coupling between a single
IX in one of the DQWs to a cloud of IXs in the other DQW, which is modeled either
as a closed-packed lattice or as a continuum IX fluid. We find that the lattice
model yields IX interlayer binding energies decreasing with increasing lattice
density. This behavior is due to the dominating role of the intra-DQW dipolar
repulsion, which prevents more than one exciton from entering the attractive region
of the inter-DQW coupling. Finally, both models shows that the single IX distorts
the distribution of IXs in the adjacent DQW, thus inducing the formation of an
IX dipolar polaron (dipolaron). While the interlayer binding energy reduces with
IX density for lattice dipolarons, the continuous polaron model predicts a nonmonotonous
dependence on density in semiquantitative agreement with a recent experimental
study [cf. Hubert et al., Phys. Rev. X 9, 021026 (2019)].
acknowledgement: "We thank W. Kaganer for discussions and for comment on the manuscript.
We acknowledge the financial support from the German-Israeli Foundation (GIF), grant
agreement I-1277-303.10/2014. M.L. acknowledges support by the Austrian Science
Fund (FWF), under project No. P29902-N27, and by the European Research Council (ERC)
Starting Grant No. 801770 (ANGULON). A.G. acknowledges support by the European Unions
Horizon 2020 research and innovation\r\nprogram under the Marie Skodowska-Curie
grant agreement No 754411. P.V.S acknowledges financial support\r\nfrom the Deutsche
Forschungsgemeinschaft (DFG) under\r\nProject No. SA 598/12-1."
article_number: '045307'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: C.
full_name: Hubert, C.
last_name: Hubert
- first_name: K.
full_name: Cohen, K.
last_name: Cohen
- 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
- first_name: R.
full_name: Rapaport, R.
last_name: Rapaport
- first_name: P. V.
full_name: Santos, P. V.
last_name: Santos
citation:
ama: Hubert C, Cohen K, Ghazaryan A, Lemeshko M, Rapaport R, Santos PV. Attractive
interactions, molecular complexes, and polarons in coupled dipolar exciton fluids.
Physical Review B. 2020;102(4). doi:10.1103/physrevb.102.045307
apa: Hubert, C., Cohen, K., Ghazaryan, A., Lemeshko, M., Rapaport, R., & Santos,
P. V. (2020). Attractive interactions, molecular complexes, and polarons in coupled
dipolar exciton fluids. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.102.045307
chicago: Hubert, C., K. Cohen, Areg Ghazaryan, Mikhail Lemeshko, R. Rapaport, and
P. V. Santos. “Attractive Interactions, Molecular Complexes, and Polarons in Coupled
Dipolar Exciton Fluids.” Physical Review B. American Physical Society,
2020. https://doi.org/10.1103/physrevb.102.045307.
ieee: C. Hubert, K. Cohen, A. Ghazaryan, M. Lemeshko, R. Rapaport, and P. V. Santos,
“Attractive interactions, molecular complexes, and polarons in coupled dipolar
exciton fluids,” Physical Review B, vol. 102, no. 4. American Physical
Society, 2020.
ista: Hubert C, Cohen K, Ghazaryan A, Lemeshko M, Rapaport R, Santos PV. 2020. Attractive
interactions, molecular complexes, and polarons in coupled dipolar exciton fluids.
Physical Review B. 102(4), 045307.
mla: Hubert, C., et al. “Attractive Interactions, Molecular Complexes, and Polarons
in Coupled Dipolar Exciton Fluids.” Physical Review B, vol. 102, no. 4,
045307, American Physical Society, 2020, doi:10.1103/physrevb.102.045307.
short: C. Hubert, K. Cohen, A. Ghazaryan, M. Lemeshko, R. Rapaport, P.V. Santos,
Physical Review B 102 (2020).
date_created: 2020-09-30T10:33:43Z
date_published: 2020-07-21T00:00:00Z
date_updated: 2025-04-14T07:43:49Z
day: '21'
department:
- _id: MiLe
doi: 10.1103/physrevb.102.045307
ec_funded: 1
external_id:
arxiv:
- '1910.06015'
isi:
- '000550579100004'
intvolume: ' 102'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1910.06015
month: '07'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P29902
name: Quantum rotations in the presence of a many-body environment
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
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: Attractive interactions, molecular complexes, and polarons in coupled dipolar
exciton fluids
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 102
year: '2020'
...