Condensed Matter Physics Seminar
2 p.m., Thursday, April 21, 2005
Room 1201, Physics Building
Dynamic response of trapped ultracold bosons on optical lattices
G. George Batrouni
(University of Nice-Sophia Antipolis)
Abstract: Trapped ultracold bosonic atoms on optical lattices are
well described by the bosonic Hubbard model. I will review the properties of
this model in the one dimensional case both with and without a trap addressing
the question of quantum phase transition from the superfluid to the Mott phase.
I will then consider the dynamic response and excitation spectrum of the system
in these phases using Quantum Monte Carlo simulations with and without a
confining potential. The dynamic structure factor, which can be measured using
Bragg spectroscopy, reveals the inhomogeneous nature of the low temperature
state, which contains coexisting Mott insulator and superfluid regions.
Host: Eyad H. Abed (ISR) and S.
Das Sarma (Physics/CMTC)
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