Detecting the tunneling rates for strongly interacting fermions on optical lattices
- Dipartimento di Fisica del Politecnico, corso Duca degli Abruzzi 24, I-10129, Torino (Italy)
Strongly interacting fermionic atoms on optical lattices are studied through a Hubbard-like model Hamiltonian, in which tunneling rates of atoms and molecules between neighboring sites are assumed to be different. In the limit of large on-site repulsion U, the model is shown to reproduce the t-J Hamiltonian, in which the J coefficient of the Heisenberg term depends on the particle-assisted tunneling rate g: explicitly, J=4g{sup 2}/U. At half-filling, g drives a crossover from a Brinkman-Rice paramagnetic insulator of fully localized atoms (g=0) to the antiferromagnetic Mott insulator of the standard Hubbard case (g=t). This is observed already in the number of doubly occupied sites under the intermediate coupling regime, thus providing a criterion for extracting from measurements the effective value of g.
- OSTI ID:
- 21408687
- Journal Information:
- Physical Review. A, Vol. 81, Issue 4; Other Information: DOI: 10.1103/PhysRevA.81.043630; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
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ATOMS
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HAMILTONIANS
INTERMEDIATE COUPLING
MOLECULES
PARAMAGNETISM
TUNNEL EFFECT
COUPLING
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