Localization of Bosonic Atoms by Fermionic Impurities in a Three-Dimensional Optical Lattice

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2006
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  • 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 K40 impurity concentration by a comparison to the corresponding superfluid to Mott-insulator transition in a pure bosonic Rb87 gas and find a significant shift in the transition parameter. The observed shift is larger than expected based on a simple mean-field argument, which indicates that disorder-related effects play a significant role. © 2006 The American Physical Society.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/cfc97146-37e4-464d-bba7-3387d4ff14c4