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

2006/04/06 by S. Ospelkaus, Silke Ospelkaus, C. Ospelkaus +7 · 40 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #Strong Light-Matter Interactions #cond-mat.stat-mech #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.96.180403

published as Phys. Rev. Lett. 96, 180403 (2006) · 4 pages, 4 figures

arxiv created 2006/04/06 · openalex publication_date 2006/05/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• Instabilities in Binary Mixtures of One-Dimensional Quantum Degenerate Gases
• High-Temperature Atomic Superfluidity in Lattice Bose-Fermi Mixtures
• Observation of resonance condensation of fermionic atom pairs

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