Bose-Einstein condensation and Berezinskii-Kosterlitz-Thouless transition in the two-dimensional nonlinear Schrödinger model

Nazarenko, Sergey, Onorato, Miguel and Proment, Davide (2014) Bose-Einstein condensation and Berezinskii-Kosterlitz-Thouless transition in the two-dimensional nonlinear Schrödinger model. Physical Review A, 90 (1). 013624. ISSN 1050-2947

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Abstract

We analyze the Bose-Einstein condensation process and the Berezinskii-Kosterlitz-Thouless phase transition within the nonlinear Schrödinger model and their interplay with wave turbulence theory. By using numerical experiments we study how the condensate fraction and the first-order correlation function behave with respect to the mass, the energy, and the size of the system. By relating the free-particle energy to the temperature, we are able to estimate the Berezinskii-Kosterlitz-Thouless transition temperature. Below this transition we observe that for a fixed temperature the superfluid fraction appears to be size independent, leading to a power-law dependence of the condensate fraction with respect to the system size.

Item Type: Article
Uncontrolled Keywords: physics.flu-dyn,cond-mat.quant-gas,cond-mat.stat-mech
Faculty \ School: Faculty of Science > School of Mathematics
Depositing User: Pure Connector
Date Deposited: 09 Jun 2014 13:38
Last Modified: 21 Apr 2020 23:03
URI: https://ueaeprints.uea.ac.uk/id/eprint/48630
DOI: 10.1103/PhysRevA.90.013624

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