Fermions in optical lattices near a Feshbach resonance: from band insulator to Mott insulator
arXiv:cond-mat/0603299 · doi:10.1103/PhysRevA.73.061601
Abstract
We study a model of an equal mixture of two species of fermions in a deep optical lattice at a filling of two fermions per site. At weak inter-species interaction, the system is a band insulator. When the inter-species interaction is tuned via a Feshbach resonance to be larger than an energy related to the energy separation of the first and second Bloch band, atoms populate equally the two Bloch bands. With weak tunneling between sites of the optical lattice, the system becomes a Mott insulator with the low energy effective Hamiltonian of a spin-1 Heisenberg antiferromagnet, because of a Hund's rule like coupling between the two bands. We discuss experimental signatures of these two types of insulators.
4 pages, 2 .eps files. Version essentially as published
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- Spatial quantum noise interferometry in expanding ultracold atom clouds
- Quantum Monte Carlo simulations of confined bosonic atoms in optical lattices
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Cited by in corpus (8)
- Many-Body Physics with Ultracold Gases
- Orbital order in Mott insulators of spinless p-band fermions
- Quantum Simulation of the Hubbard Model: The Attractive Route
- Incommensurate superfluidity of bosons in a double-well optical lattice
- Quantum Register of Fermion Pairs
- Interband physics in an ultra-cold Fermi gas in an optical lattice
- Ground state spin and excitation energies in half-filled Lieb lattices
- Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance