Heavy-Light Fermion Mixtures at Unitarity

Details Heavy-Light Fermion Mixtures at Unitarity Heavy-Light Fermion Mixtures at Unitarity

2009-01-20

arxiv.org/abs/0901.3148v2

Phys.Rev.Lett.103:060403,2009

Physics

Condensed Matter

Other Condensed Matter

4+ pages, 4 figures; 2 references added; v2 corresponds to the published version

Scientific paper

10.1103/PhysRevLett.103.060403

We investigate fermion pairing in the unitary regime for a mass ratio corresponding to a 6Li-40K mixture using Quantum Monte Carlo methods. The ground-state energy and the average light and heavy particle excitation spectrum for the unpolarized superfluid state are nearly independent of the mass ratio. In the majority light system, the polarized superfluid is close to the energy of a phase separated mixture of nearly fully polarized normal and unpolarized superfluid. For a majority of heavy particles, we find an energy minimum for a normal state with a ratio of ~ 3:1 heavy to light particles. A slight increase in attraction to kF*a ~ 2.5 yields a ground state energy of nearly zero for this ratio. A cold unpolarized system in a harmonic trap at unitarity should phase separate into three regions, with a shell of unpolarized superfluid in the middle.

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