The response to dynamical modulation of the optical lattice for fermions in the Hubbard model

Details The response to dynamical modulation of the optical lattice for fermions in the Hubbard model The response to dynamical modulation of the optical lattice for fermions in the Hubbard model

2011-04-09

arxiv.org/abs/1104.1739v1

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

Fermionic atoms in a periodic optical lattice provide a realization of the single-band Hubbard model. Using Quantum Monte Carlo simulations along with the Maximum Entropy Method, we evaluate the effect of a time-dependent perturbative modulation of the optical lattice amplitude on atomic correlations, revealed in the fraction of doubly-occupied sites. Our treatment extends previous approaches which neglected the time dependence of the on-site interaction, and shows that this term changes the results in a quantitatively significant way. The effect of modulation depends strongly on the filling-- the response of the double occupation is significantly different in the half-filled Mott insulator from the doped Fermi liquid region.

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