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      Mott insulator to superfluid transition of ultracold bosons in an optical lattice near a Feshbach resonance

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          Abstract

          We study the phase diagram of ultracold bosons in an optical lattice near a Feshbach resonance. Depending on the boson density, the strength of the optical lattice potential and the detuning from resonance, the ground state can be a Mott insulator, a superfluid phase with both an atomic and a molecular condensate, or a superfluid phase with only a molecular condensate. Mott insulator to superfluid transitions can be induced either by decreasing the strength of the optical lattice potential or by varying the detuning from the Feshbach resonance. Quite generally, we find that for a commensurate density the ground-state may undergo several insulator-superfluid or superfluid-insulator transitions as the magnetic field is varied through the resonance.

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          Author and article information

          Journal
          17 June 2004
          2005-04-15
          Article
          10.1209/epl/i2004-10514-9
          cond-mat/0406396
          Custom metadata
          Europhys. Lett. 70, 586 (2005)
          4 pages, 5 figures, RevTex 4; (v2) revised version, to appear in Europhys. Lett
          cond-mat.supr-con cond-mat.stat-mech

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