Hopping modulation in a one-dimensional Fermi-Hubbard Hamiltonian

Details Hopping modulation in a one-dimensional Fermi-Hubbard Hamiltonian Hopping modulation in a one-dimensional Fermi-Hubbard Hamiltonian

2009-04-30

arxiv.org/abs/0904.4815v2

Phys. Rev. Lett. 103, 066404 (2009)

Physics

Condensed Matter

Quantum Gases

4 pages, 5 figures; minor changes in the text, updated references;

Scientific paper

We consider a strongly repulsive two-component Fermi gas in a one-dimensional (1D) optical lattice described in terms of a Hubbard Hamiltonian. We analyze the response of the system to a periodic modulation of the hopping amplitude in presence of large two body interaction. By (essentially) exact simulations of the time evolution, we find a non-trivial double occupancy frequency dependence. We show how the dependence relates to the spectral features of the system given by the Bethe ansatz. The discrete nature of the spectrum is clearly reflected in the double occupancy after long enough modulation time. We also discuss the implications of the 1D results to experiments in higher dimensional systems.

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