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arXiv · 1104.1739

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

Zhaoxin Xu·Simone Chiesa·Shuxiang Yang·Shi-Quan Su·Daniel E. Sheehy·Juana Moreno·Richard T. Scalettar·Mark Jarrell
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Abstract

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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Zhaoxin Xu, Simone Chiesa, Shuxiang Yang, Shi-Quan Su, Daniel E. Sheehy, Juana Moreno, Richard T. Scalettar, Mark Jarrell. 2011-04-09. The response to dynamical modulation of the optical lattice for fermions in the Hubbard model. https://doi.org/10.1103/physreva.84.021607

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