Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas
Physical Review B2014Vol. 90(20)
Citations Over TimeTop 10% of 2014 papers
W. Nitsche, Na Young Kim, Georgios Roumpos, Christian Schneider, M. Kamp, Sven Höfling, A. Forchel, Y. Yamamoto
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.
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