Normal State of Highly Polarized Fermi Gases: Simple Many-Body Approaches
- Laboratoire de Physique Statistique, Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris Cedex 05 (France)
We consider the problem of a single {down_arrow} atom in the presence of a Fermi sea of {up_arrow} atoms, in the vicinity of a Feshbach resonance. We calculate the chemical potential and the effective mass of the {down_arrow} atom using two simple approaches: a many-body variational wave function and a T-matrix approximation. These two methods lead to the same results and are in good agreement with existing quantum Monte Carlo calculations performed at unitarity and, in one dimension, with the known exact solution. Surprisingly, our results suggest that, even at unitarity, the effect of interactions is fairly weak and can be accurately described using single particle-hole excitations. We also consider the case of unequal masses.
- OSTI ID:
- 20951319
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.98.180402; (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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