Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantum gases: Bosons II
Q 27.5: Vortrag
Dienstag, 18. März 2014, 15:00–15:15, UDL HS2002
Two-dimensional superfluidity in driven systems requires strong anisotropy — Ehud Altman1, John Toner2, •Lukas M. Sieberer3,4, Sebastian Diehl3,4, and Leiming Chen5 — 1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel — 2Department of Physics and Institute of Theoretical Science, University of Oregon, Eugene OR, 97403, U.S.A. — 3Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria — 4Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck — 5College of Science, The China University of Mining and Technology, Xuzhou Jiangsu, 221116, P.R. China
We show that driven two-dimensional Bose systems cannot exhibit algebraic superfluid order unless the underlying microscopic system is strongly anisotropic. Our result implies, in particular, that recent apparent evidence for Bose condensation of exciton-polaritons in semiconductor quantum wells must be an intermediate scale crossover phenomenon, while the true long distance correlations fall off exponentially. We obtain these results through a mapping of the long-wavelength condensate dynamics onto the anisotropic Kardar-Parisi-Zhang equation.