Mott insulator dynamics

Details Mott insulator dynamics Mott insulator dynamics

2011-05-06

arxiv.org/abs/1105.1263v2

Phys. Rev. A 84, 033603 (2011)

Physics

Condensed Matter

Quantum Gases

7 pages, 11 color figures. Updated in response to referee report

Scientific paper

10.1103/PhysRevA.84.033603

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.

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