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

Authors
  • Di Liberto, M.
  • Creffield, C. E.
  • Japaridze, G. I.
  • Smith, C. Morais
Type
Published Article
Publication Date
Mar 27, 2014
Submission Date
Oct 29, 2013
Identifiers
DOI: 10.1103/PhysRevA.89.013624
Source
arXiv
License
Yellow
External links

Abstract

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.

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