Itinerant-localized dual character of a strongly correlated superfluid Bose gas in an optical lattice

Y. Ohashi, M. Kitaura, H. Matsumoto

研究成果: Article査読

38 被引用数 (Scopus)

抄録

We investigate a strongly correlated Bose gas in an optical lattice. Extending the standard-basis operator method developed by Haley and Erdös to a boson Hubbard model, we calculate excitation spectra in the superfluid phase, as well as in the Mott insulating phase, at T=0. In the Mott phase, the excitation spectrum has a finite energy gap, reflecting the localized character of atoms. In the superfluid phase, the excitation spectrum is shown to have an itinerant-localized dual structure, where the gapless Bogoliubov mode (which describes the itinerant character of superfluid atoms) and a band with a finite energy gap coexist. We also show that the rf-tunneling current measurement would give useful information about the duality of a strongly correlated superfluid Bose gas near the superfluid-insulator transition.

本文言語English
論文番号033617
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
73
3
DOI
出版ステータスPublished - 2006
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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