@article{ac200aa25ed24dbdb871ac20795c8d45,
title = "Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas",
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.",
author = "W.H. Nitsche and N.Y. Kim and G. Roumpos and C. Schneider and M. Kamp and S. H{\"o}fling and A. Forchel and Y. Yamamoto",
note = "This research has been supported by the Japan Society for the Promotion of Science (JSPS) through its Funding Program for World-Leading Innovative Research and Development on Science and Technology (FIRST Program), by the U.S. Navy/SPAWAR Grant No. N66001-09-1-2024, and by the National Science Foundation Grant No. ECCS-09 25549. W.H.N. acknowledges the Gerhard Casper Stanford Graduate Fellowship.",
year = "2014",
month = nov,
day = "24",
doi = "10.1103/PhysRevB.90.205430",
language = "English",
volume = "90",
journal = "Physical Review. B, Condensed matter and materials physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "20",
}