Hopping modulation in a one-dimensional Fermi-Hubbard Hamiltonian.
We consider a strongly repulsive two-component Fermi gas in a one-dimensional 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 the presence of a large two-body interaction. By (essentially) the exact simulations of the time evolution, we find a nontrivial 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 a long enough modulation time. We also discuss the implications of the 1D results to experiments in higher dimensional systems.
Department of Applied Physics, 02015 Helsinki University of Technology, Finland.
Francesco
F
Massel
Mikko J
MJ
Leskinen
Päivi
P
Törmä