TY - JOUR
T1 - Heavy-light fermion mixtures at unitarity
AU - Gezerlis, Alexandros
AU - Gandolfi, S.
AU - Schmidt, Kevin
AU - Carlson, J.
PY - 2009/8/5
Y1 - 2009/8/5
N2 - We investigate fermion pairing in the unitary regime for a mass ratio corresponding to a Li6-K40 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 ∼31 heavy to light particles. A slight increase in attraction to kFa2.5 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.
AB - We investigate fermion pairing in the unitary regime for a mass ratio corresponding to a Li6-K40 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 ∼31 heavy to light particles. A slight increase in attraction to kFa2.5 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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U2 - 10.1103/PhysRevLett.103.060403
DO - 10.1103/PhysRevLett.103.060403
M3 - Article
AN - SCOPUS:68649125334
SN - 0031-9007
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
IS - 6
M1 - 060403
ER -