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Optical orientation, polarization pinning and depolarization dynamics in optically confined polariton condensates

Optical orientation, polarization pinning and depolarization dynamics in optically confined polariton condensates
Optical orientation, polarization pinning and depolarization dynamics in optically confined polariton condensates
We investigate the optical orientation, polarization pinning, and depolarization of optically confined semiconductor exciton-polariton condensates. We perform a complete mapping of the condensate polarization as a function of incident nonresonant excitation polarization and power. We utilize a ring-shaped excitation pattern to generate an exciton-induced potential that spatially confines polariton condensates into a single mode. We observe that formation of circular polarization in the condensate persists even for a weakly cocircularly polarized pump. By varying the excitation ring diameter we realize a transition from the condensate polarization being pinned along the coordinate-dependent cavity-strain axes, to a regime of zero degree of condensate polarization. Analysis through the driven-dissipative stochastic Gross-Pitaevskii equation reveals that this depolarization stems from a competition between sample induced in-plane polarization splitting and the condensate-reservoir overlap. An increase in the role of the latter results in weakening of the condensate fixed-point phase space attractors, and enhanced random phase space walk and appearance of limit cycle trajectories, reducing the degree of time-integrated polarization.
Exciton Polariton, polariton condensate, Semiconductor Microcavity, Nanoscale Physics, Low-dimensional Systems
2469-9969
Sigurdsson, Helgi
c6380293-fe97-4fd0-a819-cf35721d4e5d
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Gnusov, Ivan
973d41be-2823-4164-9f3e-4332d2818f07
Askitopoulos, Alexis
f5793606-9831-4b09-a148-7710fbe4d08b
Baryshev, Stepan
1860e30e-ce44-46d5-a210-1c8635e58633
Ermatov, Timur
aa23c380-e953-438d-aff3-a8aab7cd53d6
Sigurdsson, Helgi
c6380293-fe97-4fd0-a819-cf35721d4e5d
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Gnusov, Ivan
973d41be-2823-4164-9f3e-4332d2818f07
Askitopoulos, Alexis
f5793606-9831-4b09-a148-7710fbe4d08b
Baryshev, Stepan
1860e30e-ce44-46d5-a210-1c8635e58633
Ermatov, Timur
aa23c380-e953-438d-aff3-a8aab7cd53d6

Sigurdsson, Helgi, Lagoudakis, Pavlos, Gnusov, Ivan, Askitopoulos, Alexis, Baryshev, Stepan and Ermatov, Timur (2020) Optical orientation, polarization pinning and depolarization dynamics in optically confined polariton condensates. Physical Review B. (In Press)

Record type: Article

Abstract

We investigate the optical orientation, polarization pinning, and depolarization of optically confined semiconductor exciton-polariton condensates. We perform a complete mapping of the condensate polarization as a function of incident nonresonant excitation polarization and power. We utilize a ring-shaped excitation pattern to generate an exciton-induced potential that spatially confines polariton condensates into a single mode. We observe that formation of circular polarization in the condensate persists even for a weakly cocircularly polarized pump. By varying the excitation ring diameter we realize a transition from the condensate polarization being pinned along the coordinate-dependent cavity-strain axes, to a regime of zero degree of condensate polarization. Analysis through the driven-dissipative stochastic Gross-Pitaevskii equation reveals that this depolarization stems from a competition between sample induced in-plane polarization splitting and the condensate-reservoir overlap. An increase in the role of the latter results in weakening of the condensate fixed-point phase space attractors, and enhanced random phase space walk and appearance of limit cycle trajectories, reducing the degree of time-integrated polarization.

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Accepted/In Press date: 26 August 2020
Keywords: Exciton Polariton, polariton condensate, Semiconductor Microcavity, Nanoscale Physics, Low-dimensional Systems

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Local EPrints ID: 443812
URI: http://eprints.soton.ac.uk/id/eprint/443812
ISSN: 2469-9969
PURE UUID: 9312b982-62d5-44fe-bfe3-1c57bec6bbe6

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Date deposited: 14 Sep 2020 16:31
Last modified: 14 Sep 2020 16:31

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