Localization of bosonic atoms by fermionic impurities in a three-dimensional optical lattice |
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Authors: | Ospelkaus S Ospelkaus C Wille O Succo M Ernst P Sengstock K Bongs K |
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Affiliation: | Institut für Laserphysik, Luruper Chaussee 149, 22761 Hamburg, Germany. |
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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 (40)K impurity concentration by a comparison to the corresponding superfluid to Mott-insulator transition in a pure bosonic (87)Rb 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. |
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