Polarization bistability and resultant spin rings in semiconductor microcavities

The transmission of a pump laser resonant with the lower polariton branch of a semiconductor microcavity is shown to be highly dependent on the degree of circular polarization of the pump. Spin dependent anisotropy of polariton-polariton interactions allows the internal polarization to be controlled...

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Published in:Physical review letters 2010-11, Vol.105 (21), p.216402-216402, Article 216402
Main Authors: Sarkar, D, Gavrilov, S S, Sich, M, Quilter, J H, Bradley, R A, Gippius, N A, Guda, K, Kulakovskii, V D, Skolnick, M S, Krizhanovskii, D N
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container_issue 21
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container_title Physical review letters
container_volume 105
creator Sarkar, D
Gavrilov, S S
Sich, M
Quilter, J H
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Kulakovskii, V D
Skolnick, M S
Krizhanovskii, D N
description The transmission of a pump laser resonant with the lower polariton branch of a semiconductor microcavity is shown to be highly dependent on the degree of circular polarization of the pump. Spin dependent anisotropy of polariton-polariton interactions allows the internal polarization to be controlled by varying the pump power. The formation of spatial patterns, spin rings with a high degree of circular polarization, arising as a result of polarization bistability, is observed. A phenomenological model based on effective semiclassical equations of motion provides a good description of the experimental results. Inclusion of interactions with the incoherent exciton reservoir, which provides spin-independent blueshifts of the polariton modes, is found to be essential.
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title Polarization bistability and resultant spin rings in semiconductor microcavities
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