Dilute system of hard-core bosons: a soluble limit

K. Ziegler

Physica A: Statistical Mechanics and its Applications, 1994, vol. 208, issue 2, 177-190

Abstract: A model for bosons with N degenerate energy levels per site and a hard-core interaction of bosons at the same level is introduced. The limit N → ∞ can be solved exactly in terms of a saddle point integration. The zero temperature limit is investigated where the quantum fluctuations drive a transition from an insulating to a superfluid phase. The results of the calculations agree with those of the mean-field theory for weakly interacting bosons only near the phase transition.

Date: 1994
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:208:y:1994:i:2:p:177-190

DOI: 10.1016/0378-4371(94)00049-2

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