2011 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 84, no 3, 6- p.Article in journal (Refereed) Published
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 can 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.
Place, publisher, year, edition, pages
New York, N.Y.: Publ. by the American Physical Society through the American Institute of Physics , 2011. Vol. 84, no 3, 6- p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-47377DOI: 10.1103/PhysRevA.84.033603OAI: oai:DiVA.org:umu-47377DiVA: diva2:443684