Highly Polarized Fermi Gases across a Narrow Feshbach Resonance

Details Highly Polarized Fermi Gases across a Narrow Feshbach Resonance Highly Polarized Fermi Gases across a Narrow Feshbach Resonance

2011-12-06

arxiv.org/abs/1112.1282v3

Phys. Rev. A 85, 041603(R) (2012)

Physics

Condensed Matter

Quantum Gases

4.5 pages with 4 figures plus 2.5 pages with one figure of supplementary material, typos corrected, references updated

Scientific paper

10.1103/PhysRevA.85.041603

We address the phase of a highly polarized Fermi gas across a narrow Feshbach resonance starting from the problem of a single down spin fermion immersed in a Fermi sea of up spins. Both polaron and pairing states are considered using the variational wave function approach, and we find that the polaron to pairing transition will take place at the BCS side of the resonance, strongly in contrast to a wide resonance where the transition is located at the BEC side. For pairing phase, we find out the critical strength of repulsive interaction between pairs above which the mixture of pairs and fermions will not phase separate. Therefore, nearby a narrow resonance, it is quite likely that magnetism can coexist with s-wave BCS superfluidity at large Zeeman field, which is a remarkable property absent in conventional BCS superconductors (or fermion pair superfluids).

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