Title
Spatial coherence of weakly interacting one-dimensional nonequilibrium bosonic quantum fluids Spatial coherence of weakly interacting one-dimensional nonequilibrium bosonic quantum fluids
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : A : atomic, molecular and optical physics. - Lancaster, Pa, 1990 - 2015
Volume/pages
90(2014) :2 , 6 p.
ISSN
1094-1622
1050-2947
1050-2947
Article Reference
023615
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/ec2315/8410.pdf
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