Population-imbalance instability in a Bose-Hubbard ladder in the presence of a magnetic flux

Shun Uchino, Akiyuki Tokuno

研究成果: Article査読

29 被引用数 (Scopus)

抄録

We consider a two-leg Bose-Hubbard ladder in the presence of a magnetic flux. We make use of Gross-Pitaevskii, Bogoliubov, bosonization, and renormalization group approaches to reveal a structure of ground-state phase diagrams in a weak-coupling regime relevant to cold atom experiments. It is found that, except for a certain flux φ=π, the system shows different properties as changing hoppings, which also leads to a quantum phase transition similar to the ferromagnetic XXZ model. This implies that population-imbalance instability occurs for certain parameter regimes. On the other hand, for φ=π, it is shown that an umklapp process caused by commensurability of a magnetic flux stabilizes a superfluid with chirality and the system does not experience such a phase transition.

本文言語English
論文番号013625
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
92
1
DOI
出版ステータスPublished - 2015 7月 21
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学

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