Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.28: Poster
Thursday, March 17, 2011, 16:30–19:30, P1
Quantum Phase Diagram for Bosons in Optical Lattices with On-Site Interaction Modulation — •Francisco Ednilson Alves dos Santos1 and Axel Pelster2 — 1Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
In the seminal paper [1] Walter
Kohn showed with the help of Floquet theory that periodic systems, which weakly interact
with a heat bath, necessarily evolve towards an equilibrium.
On this basis we generalize the Ginzburg-Landau theory for bosons in optical lattices [2,3] to a
single-band Bose-Hubbard Hamiltonian where the on-site interaction is periodically modulated. This allows us to
characterize the location of the quantum phase transition between the Mott insulator and the
superfluid for such a periodically driven system.
[1] W. Kohn, J. Stat. Phys 103, 417 (2001).
[2] F.E.A. dos Santos and A. Pelster, Phys. Rev. A 79, 013614 (2009).
[3] B. Bradly, F.E.A. dos Santos and A. Pelster, Phys. Rev. A 79, 013615 (2009).