Molecular wavefunction and tunneling properties of a bound pair of Fermi atoms in an optical lattice

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We investigate tunneling properties of a bound pair of Fermi atoms in an optical lattice. Including a realistic cosine-shape optical lattice potential, we calculate the molecular wavefunction ψ. Starting from the weak-coupling regime, we show how ψ shrinks as one increases the strength of a pairing interaction between atoms. When the molecular size becomes comparable to the lattice constant in the intermediate coupling regime, we find from the spatial structure of ψ that the molecular tunneling between lattice sites is accompanied by virtual dissociation. This phenomenon is shown to be suppressed in the strong-coupling regime due to very strong binding energy. We point out that, while the molecular tunneling accompanied by virtual dissociation can be described by the Hubbard model, it cannot describe the molecular tunneling with no virtual dissociation in the strong-coupling regime.

本文言語English
論文番号032076
ジャーナルJournal of Physics: Conference Series
150
3
DOI
出版ステータスPublished - 2009

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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