New state of the matter between the Fermi glass and the Wigner crystal in two dimensions

TL;DR

This paper identifies a novel state of matter in two-dimensional disordered fermion systems with Coulomb interactions, existing between the Fermi glass and Wigner crystal phases, based on numerical cluster studies.

Contribution

It introduces a new intermediate state of matter in 2D disordered fermion systems, not previously characterized as Fermi glass or Wigner crystal.

Findings

New state occurs between two critical carrier densities.

Numerical evidence from small cluster studies supports the existence.

State appears in the context of insulator-metal-insulator transitions.

Abstract

Spinless fermions with Coulomb interaction in a square disordered lattice form a new state of the matter which is nor a Fermi glass, neither a Wigner crystal for intermediate Coulomb interaction. From a numerical study of small clusters, we find that this new state occurs between the two critical carrier densities where insulator-metal-insulator transitions of a hole gas have been observed in GaAs.