First-order phase transition and anomalous hysteresis of Bose gases in optical lattices

Daisuke Yamamoto, Takeshi Ozaki, Carlos A R Sá De Melo, Ippei Danshita

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We study the first-order quantum phase transitions of Bose gases in optical lattices. A special emphasis is placed on an anomalous hysteresis behavior, in which the phase transition occurs in a unidirectional way and a hysteresis loop does not form. We first revisit the hardcore Bose-Hubbard model with dipole-dipole interactions on a triangular lattice to analyze accurately the ground-state phase diagram and the hysteresis using the cluster mean-field theory combined with cluster-size scaling. Details of the anomalous hysteresis are presented. We next consider the two-component and spin-1 Bose-Hubbard models on a hypercubic lattice and show that the anomalous hysteresis can emerge in these systems as well. In particular, for the former model, we discuss the experimental feasibility of the first-order transitions and the associated hysteresis. We also explain an underlying mechanism of the anomalous hysteresis by means of the Ginzburg-Landau theory. From the given cases, we conclude that the anomalous hysteresis is a ubiquitous phenomenon of systems with a phase region of lobe shape that is surrounded by the first-order boundary.

Original languageEnglish
Article number033624
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume88
Issue number3
DOIs
Publication statusPublished - 2013 Sep 20
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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