Phase diagram of imbalanced strongly interacting fermions on a one-dimensional optical lattice

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.043602· OSTI ID:21316439

Anfossi, Alberto ^[1]; Barbiero, Luca; Montorsi, Arianna ^[2]

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1. Dipartimento di Fisica dell'Universita di Bologna, Viale Berti-Pichat 6/2, I-40127 Bologna (Italy)
2. Dipartimento di Fisica del Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino (Italy)

We show that the Hubbard Hamiltonian with particle-assisted tunneling rates - recently proposed to model a fermionic mixture near a broad Feshbach resonance - displays a ground-state phase diagram with superfluid, insulating, and phase-separated regimes. In the latter case, when the populations are balanced the two phases coexist in microscopic antiferromagnetic domains. Macroscopic phase segregation into a high-density superfluid of molecules and a low-density Fermi liquid of single atoms appears in the density profile above a critical polarization p{sub c}.

• OSTI ID: 21316439
• Journal Information: Physical Review. A, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevA.80.043602; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
ATOMS
DENSITY
FERMI GAS
FERMIONS
GROUND STATES
HAMILTONIANS
HUBBARD MODEL
MOLECULES
ONE-DIMENSIONAL CALCULATIONS
PARTICLES
PHASE DIAGRAMS
POLARIZATION
POPULATIONS
RESONANCE
SUPERFLUIDITY
TUNNEL EFFECT