Ground state energy of spin-1/2 fermions in the unitary limit
arXiv:cond-mat/0511332 · doi:10.1103/PhysRevB.73.115112
Abstract
We present lattice results for the ground state energy of a spin-1/2 fermion system in the unitary limit, where the effective range of the interaction is zero and the scattering length is infinite. We compute the ground state energy for a system of 6, 10, 14, 18, and 22 particles, with equal numbers of up and down spins in a periodic cube. We estimate that in the limit of large number of particles, the ground state energy is 0.25(3) times the ground state energy of the free Fermi system.
17 pages, 9 figures, expanded manuscript includes more data and cross-checks