Spatial coherence of weakly interacting one-dimensional nonequilibrium bosonic quantum fluids

Vladimir N. Gladilin, Kai Ji, and Michiel Wouters
Phys. Rev. A 90, 023615 – Published 11 August 2014

Abstract

We present a theoretical analysis of spatial correlations in a one-dimensional driven-dissipative nonequilibrium condensate. Starting from a stochastic generalized Gross-Pitaevskii equation, we derive a noisy Kuramoto-Sivashinsky equation for the phase dynamics. For sufficiently strong interactions, the coherence decays exponentially in close analogy to the equilibrium Bose gas. When interactions are small on a scale set by the nonequilibrium condition, we find through numerical simulations a crossover between a Gaussian and exponential decay with peculiar scaling of the coherence length on the fluid density and noise strength.

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  • Received 29 November 2013
  • Revised 11 June 2014

DOI:https://doi.org/10.1103/PhysRevA.90.023615

©2014 American Physical Society

Authors & Affiliations

Vladimir N. Gladilin1,2, Kai Ji1, and Michiel Wouters1

  • 1TQC, Universiteit Antwerpen, Universiteitsplein 1, B-2610 Antwerpen, Belgium
  • 2INPAC, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium

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Vol. 90, Iss. 2 — August 2014

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