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Anomalous exciton Hall effect

Anomalous exciton Hall effect
Anomalous exciton Hall effect
It is well known that electrically neutral excitons can still be affected by crossed electric and magnetic fields that make them move in a direction perpendicular to both fields. We show that a similar effect appears in the absence of external electric fields, in the case of scattering of an exciton flow by charged impurities in the presence of the external magnetic field. As a result, the exciton flow changes the direction of its propagation that may be described in terms of the Hall conductivity for excitons. We develop a theory of this effect, which we refer to as the anomalous exciton Hall effect, to distinguish it from the exciton Hall effect that arises due to the valley selective exciton transport in transition metal dichalcogenides. According to our estimations, the effect is relatively weak for optically active or bright excitons in conventional GaAs quantum wells, but it becomes significant for optically inactive or dark excitons, because of the difference of the lifetimes. This makes the proposed effect a convenient tool for spatial separation of dark and bright excitons.
1079-7114
Kozin, V.K.
b0647e59-0a27-4ffd-983d-40cd3df65c59
Shabashov, V.A.
b130d26f-60c3-4243-bb61-bcc1acd72644
Kavokin, A.V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Shelykh, I.A.
7dad78b3-4681-410a-abf2-39f3bb16c41f
Kozin, V.K.
b0647e59-0a27-4ffd-983d-40cd3df65c59
Shabashov, V.A.
b130d26f-60c3-4243-bb61-bcc1acd72644
Kavokin, A.V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Shelykh, I.A.
7dad78b3-4681-410a-abf2-39f3bb16c41f

Kozin, V.K., Shabashov, V.A., Kavokin, A.V. and Shelykh, I.A. (2021) Anomalous exciton Hall effect. Physical Review Letters, 126 (3), [036801]. (doi:10.1103/PhysRevLett.126.036801).

Record type: Article

Abstract

It is well known that electrically neutral excitons can still be affected by crossed electric and magnetic fields that make them move in a direction perpendicular to both fields. We show that a similar effect appears in the absence of external electric fields, in the case of scattering of an exciton flow by charged impurities in the presence of the external magnetic field. As a result, the exciton flow changes the direction of its propagation that may be described in terms of the Hall conductivity for excitons. We develop a theory of this effect, which we refer to as the anomalous exciton Hall effect, to distinguish it from the exciton Hall effect that arises due to the valley selective exciton transport in transition metal dichalcogenides. According to our estimations, the effect is relatively weak for optically active or bright excitons in conventional GaAs quantum wells, but it becomes significant for optically inactive or dark excitons, because of the difference of the lifetimes. This makes the proposed effect a convenient tool for spatial separation of dark and bright excitons.

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Anomalous Exciton Hall Effect - Accepted Manuscript
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More information

Accepted/In Press date: 5 January 2021
e-pub ahead of print date: 21 January 2021
Additional Information: ARXIV IS AM

Identifiers

Local EPrints ID: 447076
URI: http://eprints.soton.ac.uk/id/eprint/447076
ISSN: 1079-7114
PURE UUID: bbf3712e-73b2-480b-83e1-859218a355a9

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Date deposited: 02 Mar 2021 17:33
Last modified: 25 Nov 2021 20:39

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Contributors

Author: V.K. Kozin
Author: V.A. Shabashov
Author: A.V. Kavokin
Author: I.A. Shelykh

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