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Title: Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates

Abstract

We theoretically study the superfluidity properties of a nonequilibrium Bose-Einstein condensate of exciton polaritons in a semiconductor microcavity under incoherent pumping. The dynamics of the condensate is described at mean-field level in terms of a generalized Gross-Pitaevskii equation. The drag force on a small moving object and the onset of fringes in the density profile are shown to have a sharp threshold as a function of the velocity; a generalized Landau criterion is developed to explain this behavior in terms of the dispersion of elementary excitations. Metastability of supercurrents in multiply-connected geometries is shown to persist up to higher flow speeds.

Authors:
 [1];  [2]
  1. Institute of Theoretical Physics, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)
  2. INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, I-38123 Povo (Italy)
Publication Date:
OSTI Identifier:
21410895
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevLett.105.020602; (c) 2010 The American Physical Society; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSE-EINSTEIN CONDENSATION; CRITICAL VELOCITY; DENSITY; EXCITATION; EXCITONS; MEAN-FIELD THEORY; NUCLEAR PUMPING; POLARONS; SEMICONDUCTOR MATERIALS; SUPERFLUIDITY; WAVE FUNCTIONS; ENERGY-LEVEL TRANSITIONS; FUNCTIONS; MATERIALS; PHYSICAL PROPERTIES; PUMPING; QUASI PARTICLES; VELOCITY

Citation Formats

Wouters, Michiel, and Carusotto, Iacopo. Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.105.020602.
Wouters, Michiel, & Carusotto, Iacopo. Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates. United States. doi:10.1103/PHYSREVLETT.105.020602.
Wouters, Michiel, and Carusotto, Iacopo. Fri . "Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates". United States. doi:10.1103/PHYSREVLETT.105.020602.
@article{osti_21410895,
title = {Superfluidity and Critical Velocities in Nonequilibrium Bose-Einstein Condensates},
author = {Wouters, Michiel and Carusotto, Iacopo},
abstractNote = {We theoretically study the superfluidity properties of a nonequilibrium Bose-Einstein condensate of exciton polaritons in a semiconductor microcavity under incoherent pumping. The dynamics of the condensate is described at mean-field level in terms of a generalized Gross-Pitaevskii equation. The drag force on a small moving object and the onset of fringes in the density profile are shown to have a sharp threshold as a function of the velocity; a generalized Landau criterion is developed to explain this behavior in terms of the dispersion of elementary excitations. Metastability of supercurrents in multiply-connected geometries is shown to persist up to higher flow speeds.},
doi = {10.1103/PHYSREVLETT.105.020602},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 2,
volume = 105,
place = {United States},
year = {2010},
month = {7}
}