Dynamic response of trapped ultracold bosons on optical lattices

We study the dynamic response of ultracold bosons trapped in one-dimensional optical lattices using Quantum Monte Carlo simulations of the boson Hubbard model with a confining potential. The dynamic structure factor reveals the inhomogeneous nature of the low temperature state, which contains coexis...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2005-09, Vol.72 (3), Article 031601
Main Authors: Batrouni, G. G., Assaad, F. F., Scalettar, R. T., Denteneer, P. J. H.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BOSE-EINSTEIN CONDENSATION
BOSONS
COMPUTERIZED SIMULATION
Condensed Matter
EXCITATION
HUBBARD MODEL
Mesoscopic Systems and Quantum Hall Effect
MONTE CARLO METHOD
ONE-DIMENSIONAL CALCULATIONS
Physics
POTENTIALS
RUBIDIUM 87
Statistical Mechanics
STRUCTURE FACTORS
SUPERFLUIDITY
TRAPPING
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Summary:We study the dynamic response of ultracold bosons trapped in one-dimensional optical lattices using Quantum Monte Carlo simulations of the boson Hubbard model with a confining potential. The dynamic structure factor reveals the inhomogeneous nature of the low temperature state, which contains coexisting Mott insulator and superfluid regions. We present new evidence for local quantum criticality and shed new light on the experimental excitation spectrum of 87Rb atoms confined in one dimension.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.72.031601