Superfluid-to-insulator phase transition in a unitary Fermi gas

Nir Barnea*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We study the properties of a dilute low-energy two-component Fermi gas. To this end, we approximate the Fermi gas by the Hubbard lattice Hamiltonian and solve it using the dynamical mean-field approximation. At unitarity, this approximation yields the value ξ0.44 for the ratio between the ground-state energy per particle of the interacting and free systems (EN=ξ EFG), in remarkable agreement with full quantum Monte Carlo simulations. Investigating the evolution of the system with temperature, we have found that below the critical temperature Tc, the system is a superfluid and the energy gap is decreasing monotonously. For temperatures above Tc, the system is an insulator and the corresponding energy gap is monotonously increasing.

Original languageAmerican English
Article number053629
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume78
Issue number5
DOIs
StatePublished - 24 Nov 2008

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