Polarized Fermi Condensates with Unequal Masses: Tuning the Tricritical Point
- Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 0HE (United Kingdom)
- Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP (United Kingdom)
We consider a two-component atomic Fermi gas within a mean-field, single-channel model, where both the mass and population of each component are unequal. We show that the tricritical point at zero temperature evolves smoothly from the BEC to BCS side of the resonance as a function of mass ratio r. We find that the interior gap state proposed by Liu and Wilczek is always unstable to phase separation, while the breached pair state with one Fermi surface for the excess fermions exhibits differences in its density of states and pair correlation functions depending on which side of the resonance it lies. Finally, we show that, when r > or appro. 3.95, the finite-temperature phase diagram of trapped gases at unitarity becomes topologically distinct from the equal mass system.
- OSTI ID:
- 20951240
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.98.160402; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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