A Novel Non-Fermi Liquid Ground State in One Dimension

TL;DR

This paper introduces a new non-Fermi liquid ground state in one dimension, characterized by a flat momentum distribution and unique excitation dispersion, differing fundamentally from Luttinger and Fermi liquids.

Contribution

It proposes a novel non-Fermi liquid state in 1D with long-range interactions, featuring a flat momentum distribution and sublinear gapless excitations.

Findings

Momentum distribution is flat near Fermi points.

Elementary excitations have sublinear, gapless dispersion.

Conductance differs from that of a Luttinger wire.

Abstract

We propose a new non-Fermi liquid ground state in one dimension that is not of the Luttinger type. It is the ground state of fermions interacting via a long range repulsive interaction in real space of the form $ V(x) = e^2/|x| $. We characterise it by computing the momentum distribution which is perfectly flat near the Fermi points signalling a radical departure from Luttinger liquid theory(and Fermi liquid theory). The dispersion of elementary excitations is found to be sublinear but gapless of the form $ v {} |q| {}[ Log[2k_{F}/|q| ]^{{1/2}} $. We also compute the conductance of a mesoscopic wire made of such objects and contrast it from the answer we obtain for a Luttinger wire.