Tunneling properties of a bound pair of Fermi atoms in an optical lattice

Abstract

We investigate tunneling properties of a bound pair of Fermi atoms in an optical lattice, comparing with results obtained in an attractive Hubbard model. In the strong coupling regime of the Hubbard model, it has been predicted that the motion of a bound pair between lattice sites is accompanied by virtual dissociation. To explore the possibility of this interesting phenomenon in optical lattice, we calculate molecular wavefunction in a cosine-shape periodic potential. We show that the molecular tunneling accompanied by dissociation occurs in the intermediate coupling regime of the optical lattice system. In the strong coupling regime, in contrast to the prediction in the Hubbard model, the bound pair is shown to tunnel through lattice potential without dissociation. As a result, the magnitude of molecular band mass M remains finite even in the strong coupling limit, which is in contrast to the diverging molecular mass in the case of the Hubbard model. Including this finite value of molecular band mass, we evaluate the superfluid phase transition temperature Tc in the BEC limit of the optical lattice system, where the Hubbard model gives Tc=0 due to the diverging molecular mass.

arXiv comment20 pages, 9 figures

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Cited by in corpus (6)

• Fulde-Ferrell-Larkin-Ovchinnikov phase in the presence of pair hopping interaction
• Two-body problem in a multiband lattice and the role of quantum geometry
• Dynamics and symmetries of a repulsively bound atom pair in an infinite optical lattice
• Effects of periodic potentials on the critical velocity of superfluid Fermi gases in the BCS-BEC crossover
• Doublon dynamics of Bose-Fermi mixtures in optical lattices
• Spin-1/2 fermions with attractive interaction in an optical lattice