Localization of bosonic atoms by fermionic impurities in a 3d optical lattice
Statistical Mechanics
2007-05-23 v1 Strongly Correlated Electrons
Abstract
We observe a localized phase of ultracold bosonic quantum gases in a 3-dimensional optical lattice induced by a small contribution of fermionic atoms acting as impurities in a Fermi-Bose quantum gas mixture. In particular we study the dependence of this transition on the fermionic 40K impurity concentration by a comparison to the corresponding superfluid to Mott insulator transition in a pure bosonic 87Rb gas and find a significant shift in the transition parameter. The observed shift is larger than expected based on a mean-field argument, which is a strong indication that disorder-related effects play a significant role.
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Cite
@article{arxiv.cond-mat/0604179,
title = {Localization of bosonic atoms by fermionic impurities in a 3d optical lattice},
author = {S. Ospelkaus and C. Ospelkaus and O. Wille and M. Succo and P. Ernst and K. Sengstock and K. Bongs},
journal= {arXiv preprint arXiv:cond-mat/0604179},
year = {2007}
}
Comments
4 pages, 4 figures