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.
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Host: Eyad H. Abed (ISR) and S.
Das Sarma (Physics/CMTC)
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