Quantum simulation of correlated-hopping models with fermions in optical lattices

Di Liberto, M. and Creffield, C. E. and Japaridze, G.I. and Morais Smith, C. (2014) Quantum simulation of correlated-hopping models with fermions in optical lattices. Physical Review A, 89 (1). 011324-1.


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By using a modulated magnetic field in a Feshbach resonance for ultracold fermionic atoms in optical lattices, we show that it is possible to engineer a class of models usually referred to as correlated-hopping models. These models differ from the Hubbard model in exhibiting additional density-dependent interaction terms that affect the hopping processes. In addition to the spin-SU(2) symmetry, they also possess a charge-SU(2) symmetry, which opens the possibility of investigating the $\eta$-pairing mechanism for superconductivity introduced by Yang for the Hubbard model. We discuss the known solution of the model in 1D (where $\eta$ states have been found in the degenerate manifold of the ground state) and show that, away from the integrable point, quantum Monte Carlo simulations at half filling predict the emergence of a phase with coexisting incommensurate spin and charge order.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties/Schools > School of Natural Sciences and Engineering
Depositing User: გიორგი ჯაფარიძე
Date Deposited: 30 Jan 2014 12:31
Last Modified: 03 Apr 2015 06:49
URI: http://eprints.iliauni.edu.ge/id/eprint/722

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