Mott insulator dynamics
arXiv:1105.1263 · doi:10.1103/PhysRevA.84.033603
Abstract
The hydrodynamics of a lattice Bose gas in a time-dependent external potential is studied in a mean-field approximation. The conditions under which a Mott insulating region can melt, and the local density adjust to the new potential, are determined. In the case of a suddenly switched potential, it is found that the Mott insulator stays insulating and the density will not adjust if the switch is too abrupt. This comes about because too rapid currents result in Bloch oscillation-type current reversals. For a stirrer moved through a Mott insulating cloud, it is seen that only if the stirrer starts in a superfluid region and the velocity is comparable to the time scale set by the tunneling, will the Mott insulator be affected.
7 pages, 11 color figures. Updated in response to referee report
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Cited by in corpus (4)
- Expansion velocity of a one-dimensional, two-component Fermi gas during the sudden expansion in the ballistic regime
- Mott-insulator state of cold atoms in tilted optical lattices: doublon dynamics and multi-level Landau-Zener tunneling
- Kelvin-Helmholtz instability in two-component Bose gases on a lattice
- Application of the inhomogeneous Kibble-Zurek mechanism to quench dynamics in the transition from a Mott-insulator to a superfluid in a finite system