Phys. Rev. Lett. 93, 200402 (2004) [4 pages]Novel Superfluidity in a Trapped Gas of Fermi Atoms with Repulsive Interaction Loaded on an Optical LatticeReceived 2 July 2004; published 9 November 2004 We investigate a possibility of superfluidity in a trapped gas of Fermi atoms with a repulsive interaction in the presence of an optical lattice. Applying the exact diagonalization method to a one-dimensional Hubbard model including the trap potential, we find that, when the strength of the repulsive interaction exceeds a critical value, the binding energy of two Fermi atoms becomes negative below the half-filling case, indicating that an attractive interaction effectively works between Fermi atoms. In this case, a “Mott insulating core” appears in the center of the trap, where each site is occupied by one atom. The Cooper-pair correlation strongly develops between atoms in the left- and right-hand sides of this core. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.200402
DOI:
10.1103/PhysRevLett.93.200402
PACS:
03.75.Ss, 05.30.Fk, 71.30.+h, 74.20.Mn
See AlsoComment: M. Rigol, S. R. Manmana, A. Muramatsu, R. T. Scalettar, R. R. Singh, and S. Wessel, Comment on “Novel Superfluidity in a Trapped Gas of Fermi Atoms with Repulsive Interaction Loaded on an Optical Lattice”, Phys. Rev. Lett. 95, 218901 (2005). Reply: M. Machida, S. Yamada, Y. Ohashi, and H. Matsumoto, Machida et al. Reply:, Phys. Rev. Lett. 95, 218902 (2005). |
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