Pairing and Density-Wave Phases in Boson-Fermion Mixtures at Fixed Filling

Journal Article · Fri Sep 07 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.100401· OSTI ID:21028189

Klironomos, F D; Tsai, S -W ^[1]

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1. Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States)

We study a mixture of fermionic and bosonic cold atoms on a two-dimensional optical lattice, where the fermions are prepared in two isospin states and the bosons have Bose-Einstein condensed. Number density fluctuations of the condensate form delocalized bosonic modes which couple to the fermionic atoms similarly to the electron-phonon coupling in crystals. We study the phase diagram for this system at fixed fermion density of one per site. We find that tuning of the lattice parameters and interaction strengths drives the system to undergo antiferromagnetic ordering, s-wave and d-wave pairing superconductivity, or a charge density-wave phase. We use functional renormalization group analysis where retardation effects are fully taken into account. We calculate response functions and also provide estimates of the energy gap associated with the dominant order, and how it depends on different parameters of the problem.

• OSTI ID: 21028189
• Journal Information: Physical Review Letters, Vol. 99, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.99.100401; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BOSONS
CHARGE DENSITY
CONDENSATES
CRYSTALS
D WAVES
ELECTRON-PHONON COUPLING
ENERGY GAP
FERMIONS
ISOSPIN
LATTICE PARAMETERS
PHASE DIAGRAMS
RENORMALIZATION
RESPONSE FUNCTIONS
S WAVES
SUPERCONDUCTIVITY
TWO-DIMENSIONAL CALCULATIONS