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Spatial correlation functions of one-dimensional Bose gases at equilibrium

Lookup NU author(s): Professor Nikolaos Proukakis

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Abstract

The dependence of the three lowest order spatial correlation functions of a harmonically confined Bose gas on temperature and interaction strength is presented at equilibrium. Our analysis is based on a stochastic Langevin equation for the order parameter of a weakly interacting gas. Comparison of the predicted first order correlation functions to those of appropriate mean field theories demonstrates the potentially crucial role of density fluctuations on the equilibrium coherence length. Furthermore, the change in both coherence length and shape of the correlation function, from Gaussian to exponential, with increasing temperature is quantified. Moreover, the presented results for higher order correlation functions are shown to be in agreement with existing predictions. Experimentalists often define a "quasi-condensate" via bimodal density fits, and this work reveals how consideration of local density-density correlations provides an alternative determination of this quantity.


Publication metadata

Author(s): Proukakis NP

Publication type: Article

Publication status: Published

Journal: Physical Review A: Atomic, Molecular and Optical Physics

Year: 2006

Volume: 74

Issue: 5

ISSN (print): 1050-2947

ISSN (electronic): 1094-1622

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevA.74.053617

DOI: 10.1103/PhysRevA.74.053617


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