Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas

W.H. Nitsche, N.Y. Kim, G. Roumpos, C. Schneider, M. Kamp, S. Höfling, A. Forchel, Y. Yamamoto

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Abstract

We observe quasi-long-range coherence in a two-dimensional condensate of exciton-polaritons. Our measurements confirm that the spatial correlation algebraically decays with a slow power law, whose exponent quantitatively behaves as predicted by the Berezinskii-Kosterlitz-Thouless theory. The exciton-polaritons are created by nonresonant optical pumping of a microcavity sample with embedded GaAs quantum wells at liquid helium temperature. Michelson interference is used to measure the coherence of the photons emitted by decaying exciton-polaritons.
Original languageEnglish
JournalPhysical Review. B, Condensed matter and materials physics
Volume90
Issue number20
DOIs
Publication statusPublished - 24 Nov 2014

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