Quantum Phases in a Resonantly Interacting Boson-Fermion Mixture

Journal Article · Fri Jun 17 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.230404· OSTI ID:20696367

Dickerscheid, D B.M. ^[1]; Oosten, D van ^[1]; Tillema, E J; Stoof, H T.C. ^[1]

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1. Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht (Netherlands)

We consider a resonantly interacting boson-fermion mixture of {sup 40}K and {sup 87}Rb atoms in an optical lattice. We show that by using a red-detuned optical lattice the mixture can be accurately described by a generalized Hubbard model for {sup 40}K and {sup 87}Rb atoms, and {sup 40}K-{sup 87}Rb molecules. The microscopic parameters of this model are fully determined by the details of the optical lattice and the interspecies Feshbach resonance in the absence of the lattice. We predict a quantum phase transition to occur in this system already at low atomic filling fraction, and present the phase diagram as a function of the temperature and the applied magnetic field.

• OSTI ID: 20696367
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 94; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
BEAM OPTICS
BOSE-EINSTEIN CONDENSATION
BOSONS
FERMIONS
HUBBARD MODEL
MAGNETIC FIELDS
MIXTURES
MOLECULES
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHOTON-ATOM COLLISIONS
POTASSIUM 40
QUANTUM MECHANICS
RESONANCE
RUBIDIUM 87