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

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.

4 pages, 5 figures, RevTex 4; (v2) revised version, to appear in Europhys. Lett

References in corpus (3)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Quantum Monte Carlo simulations of confined bosonic atoms in optical lattices
• Spin-1 bosons with coupled ground states in optical lattices

Cited by in corpus (9)

• The Stochastic Green Function (SGF) algorithm
• Superfluid-Insulator Transitions in Attractive Bose-Hubbard Model with Three-Body Constraint
• Feshbach-Einstein condensates
• Quantum phases of mixtures of atoms and molecules on optical lattices
• Thermal Phase transitions in attractive extended Bose-Hubbard Model with three-body constraint
• Feshbach-Stabilized Insulator of Bosons in Optical Lattices
• Quantum and Thermal Phase Transitions in a Bosonic Atom-Molecule Mixture in a Two-dimensional Optical Lattice
• Quantum Phase Transitions in Bosonic Heteronuclear Pairing Hamiltonians
• Phase diagram of imbalanced strongly interacting fermions on a one-dimensional optical lattice