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Effects of Bose-Einstein condensation of exciton polaritons in microcavities on the polarization of emitted light

Effects of Bose-Einstein condensation of exciton polaritons in microcavities on the polarization of emitted light
Effects of Bose-Einstein condensation of exciton polaritons in microcavities on the polarization of emitted light
It is shown theoretically that Bose condensation of spin-degenerated exciton polaritons results in spontaneous buildup of the linear polarization in emission spectra of semiconductor microcavities and therefore that linear polarization is a good order parameter for the polariton Bose condensation under unpolarized pumping. If spin degeneracy is lifted, an elliptically polarized light is emitted by the polariton condensate. The main axis of the ellipse rotates in time due to self-induced Larmor precession of the polariton condensate pseudospin. The polarization decay time is governed by the dephasing induced by the polariton-polariton interaction and is strongly dependent on the statistics of the condensed state. If the elliptical polarization preexists in the system as a result of pumping, the lifetime of the linear part of the polarization is also extremely sensitive to the degree of circular polarization induced in the system by pumping. This decay time can be used to measure the coherence degree of the condensate as a function of the polarization of the emitted light, as opposed to more conventional but harder particle counting experiments of the Hanbury Brown-Twiss type.
excitons, microcavities, bose condensation
1550-235X
035315-[11pp]
Laussy, F.P.
1ed745d2-e84d-4457-81d2-5568c5c9c753
Shelykh, I.A.
7dad78b3-4681-410a-abf2-39f3bb16c41f
Malpuech, G.
da5f02e8-b721-4a4b-a3fc-cb756b396e4a
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Laussy, F.P.
1ed745d2-e84d-4457-81d2-5568c5c9c753
Shelykh, I.A.
7dad78b3-4681-410a-abf2-39f3bb16c41f
Malpuech, G.
da5f02e8-b721-4a4b-a3fc-cb756b396e4a
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b

Laussy, F.P., Shelykh, I.A., Malpuech, G. and Kavokin, A. (2006) Effects of Bose-Einstein condensation of exciton polaritons in microcavities on the polarization of emitted light. Physical Review B, 73 (3), 035315-[11pp]. (doi:10.1103/PhysRevB.73.035315).

Record type: Article

Abstract

It is shown theoretically that Bose condensation of spin-degenerated exciton polaritons results in spontaneous buildup of the linear polarization in emission spectra of semiconductor microcavities and therefore that linear polarization is a good order parameter for the polariton Bose condensation under unpolarized pumping. If spin degeneracy is lifted, an elliptically polarized light is emitted by the polariton condensate. The main axis of the ellipse rotates in time due to self-induced Larmor precession of the polariton condensate pseudospin. The polarization decay time is governed by the dephasing induced by the polariton-polariton interaction and is strongly dependent on the statistics of the condensed state. If the elliptical polarization preexists in the system as a result of pumping, the lifetime of the linear part of the polarization is also extremely sensitive to the degree of circular polarization induced in the system by pumping. This decay time can be used to measure the coherence degree of the condensate as a function of the polarization of the emitted light, as opposed to more conventional but harder particle counting experiments of the Hanbury Brown-Twiss type.

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Published date: 17 January 2006
Keywords: excitons, microcavities, bose condensation

Identifiers

Local EPrints ID: 19367
URI: http://eprints.soton.ac.uk/id/eprint/19367
ISSN: 1550-235X
PURE UUID: 3c3e3025-1c18-4e32-8534-a3d216758e1b

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Date deposited: 13 Feb 2006
Last modified: 19 Nov 2021 18:29

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Contributors

Author: F.P. Laussy
Author: I.A. Shelykh
Author: G. Malpuech
Author: A. Kavokin

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