Localization of bosonic atoms by fermionic impurities in a 3d optical lattice

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.

4 pages, 4 figures

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• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Mixtures of Bosonic and Fermionic Atoms in Optical Lattices
• Instabilities in binary mixtures of one-dimensional quantum degenerate gases
• Interaction-driven Dynamics of 40K / 87Rb Fermi-Bose Gas Mixtures in the Large Particle Number Limit
• Spatial correlations of trapped 1d bosons in an optical lattice
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Cited by in corpus (69)

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• Supersolid Bose-Fermi Mixtures in Optical Lattices
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• Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates
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• Mixtures of strongly interacting bosons in optical lattices
• Mean-field phase diagram of disordered bosons in a lattice at non-zero temperature
• Mean-field phase diagram of cold lattice bosons in disordered potentials
• Stochastic Mean-Field Theory for the Disordered Bose-Hubbard Model
• Heteronuclear molecules in an optical lattice: Theory and experiment
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• Do mixtures of bosonic and fermionic atoms adiabatically heat up in optical lattices?
• Supersolidity of cold-atom Bose-Fermi mixtures in optical lattices
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• Effective Action Approach for Quantum Phase Transitions in Bosonic Lattices
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• Degenerate Fermi gas in a combined harmonic-lattice potential
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• On-site number statistics of ultracold lattice bosons
• Boson-Fermion pairing in Bose-Fermi mixtures on 1D optical lattices
• Exotic Superconducting Phases of Ultracold Atom Mixtures on Triangular Lattices
• Generalized Dynamical Mean-Field Theory for Bose-Fermi Mixtures in Optical Lattices
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• Density and Stability in Ultracold Dilute Boson-Fermion Mixtures
• Mott insulators and correlated superfluids in ultracold Bose-Fermi mixtures
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• Disorder-Induced Shift of Condensation Temperature for Dilute Trapped Bose Gases
• Spatial noise correlations of a chain of ultracold fermions - A numerical study
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• Unconventional quantum phases of lattice bosonic mixtures
• Thermodynamical approaches to efficient sympathetic cooling in ultracold Fermi-Bose atomic mixtures
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• Quantum Monte Carlo simulations of bosonic and fermionic impurities in a two-dimensional hard-core boson system