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arXiv · 1007.3592

Polarization bistability and resultant spin rings in semiconductor microcavities

D. Sarkar·S. S. Gavrilov·M. Sich·J. H. Quilter·R. A. Bradley·N. A. Gippius·K. Guda·V. D. Kulakovskii·M. S. Skolnick·D. N. Krizhanovskii
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Abstract

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 high degree of circular polarization, arising as a result of polarization bistability, is observed. A phenomenological model based on spin dependent Gross-Pitaevskii equations 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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D. Sarkar, S. S. Gavrilov, M. Sich, J. H. Quilter, R. A. Bradley, N. A. Gippius, K. Guda, V. D. Kulakovskii, M. S. Skolnick, D. N. Krizhanovskii. 2010-07-21. Polarization bistability and resultant spin rings in semiconductor microcavities. https://doi.org/10.1103/physrevlett.105.216402

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