Probing phase-separation in Bose-Fermi mixtures by the critical superfluid velocity
arXiv:0908.1569 · doi:10.1103/PhysRevA.81.013622
Abstract
We investigate the effect exerted by spin-polarized fermions on the interaction between superfluid bosons for a Bose-Fermi mixture residing on an optical lattice, with particular emphasis on the possibility of an induced phase-separation. Using a set of microscopic parameters relevant to a K-Rb mixture, we show how the phase-separation criterion may be directly probed by means of the critical superfluid velocity of the bosonic condensate. We report quantitative results for the magnitude of the superfluid velocity and its dependence on the trap depth, the boson-fermion interaction, and the fermionic filling fraction. All of these parameters can be controlled experimentally in a well-defined manner. We propose an experimental setup for probing the critical superfluid velocity.
7 pages, 5 figures
References in corpus (18)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
- Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice
- Condensate fraction in a 2D Bose gas measured across the Mott-insulator transition
- High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures
- Non-dissipative drag of superflow in a two-component Bose gas
- Dynamical and energetic instabilities in multi-component Bose-Einstein condensates in optical lattices
- Sound velocity and multibranch Bogoliubov spectrum of an elongated Fermi superfluid in the BEC-BCS crossover
- Supersolidity of cold-atom Bose-Fermi mixtures in optical lattices
- Bose-Fermi mixtures in an optical lattice
- Pulsating and persistent vector solitons in a Bose-Einstein condensate in a lattice upon phase separation instability
- Drag effect and topological complexes in strongly interacting two-component lattice superfluids
- Thermal Fluctuations of Vortex Matter in Trapped Bose-Einstein Condensates
- Bogoliubov speed of sound for a dilute Bose-Einstein condensate in a 3d optical lattice
- Critical velocities in two-component superfluid Bose gases
- Effects of boundaries and density inhomogeneity on states of vortex matter in Bose--Einstein condensates at finite temperature
- Fermionic superfluid properties in a one-dimensional optical lattice