Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas
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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.
Nitsche , W H , Kim , N Y , Roumpos , G , Schneider , C , Kamp , M , Höfling , S , Forchel , A & Yamamoto , Y 2014 , ' Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas ' , Physical Review. B, Condensed matter and materials physics , vol. 90 , no. 20 . https://doi.org/10.1103/PhysRevB.90.205430
Physical Review. B, Condensed matter and materials physics
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