Long-range correlations in fermi fluids

T. R. Kirkpatrick, D. Belitz

MANFRED L. RISTIG, P. M. Lam

Thomas Schäfer

Elvia Colella, Maria Luisa Chiofalo, Michele Barsanti +2 more

Abstract We discuss the fluid structure in the quantum phases of a 1D spinful Fermi gas of atoms interacting via an infinitely long-range coupling, as it may result from a photon-mediated two-body coupling in optical cavities. The system reveals a rich physics, where the spin/charge-density wave and superfluid-like order compete with each other. Following our previous work based on a combined mean-field, exact diagonalization and bosonization analysis, we provide the phase diagram of the system and discuss the structure of the fluid, addressing the main features in momentum space of the order parameters, momentum distribution and two-body correlations. We highlight that the nesting of the Fermi surface in 1D ultimately drives the formation of periodic structures commensurate with the cavity-induced mean-field potential.

B.T. Geilikman

The ground state energy and other characteristics of a Fermi system are calculated by employing the Green function method and theory of Fermi fluids. The calculations are carried out for long range and short range potential components such that n/sup 1/3/ r/sub s/ > 1 where r/ sub s/ and r/sub l/ are the ranges of action of the short- and long-range force components and n is the particle density. (auth)

Tai Kai Ng