期刊
COMPUTER PHYSICS COMMUNICATIONS
卷 185, 期 7, 页码 1926-1931出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cpc.2014.03.021
关键词
BEC; 1D; Metropolis-Hastings algorithm; Monte-Carlo simulations; Gross-Pitaevskii equation
资金
- Austrian Science Fund (FWF) [P22590-N16, Z118-N16]
- Vienna Doctoral Program on Complex Quantum Systems (CoQuS)
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
We demonstrate the application of the Metropolis-Hastings algorithm to sampling of classical thermal states of one-dimensional Bose-Einstein quasicondensates in the classical fields approximation, both in untrapped and harmonically trapped case. The presented algorithm can be easily generalized to higher dimensions and arbitrary trap geometry. For truncated Wigner simulations the quantum noise can be added with conventional methods (half a quantum of energy in every mode). The advantage of the presented method over the usual analytical and stochastic ones lies in its ability to sample not only from canonical and grand canonical distributions, but also from the generalized Gibbs ensemble, which can help to shed new light on thermodynamics of integrable systems. (C) 2014 The Authors. Published by Elsevier B.V.
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