Signatures of an intermediate 2d Coulomb phase at low temperatures

Abstract

The study of the ground state of spinless fermions in 2d disordered clusters (Phys. Rev. Lett. {\bf 83}, 1826 (1999)) has suggested the existence of a new quantum phase for intermediate Coulomb energy to kinetic energy ratios $r_s$. Exact diagonalization of the same small clusters show that its low energy excitations (quantum ergodicity above a few ``hexatic'' excitations characterized by oriented currents) significantly differ from those occuring in the Fermi glass (weak $r_s$) and in the pinned Wigner crystal (large $r_s$). The ``hexatic'' excitations vanish for temperatures of order of the Fermi temperature.

7 pages, 3 figures, to be published in Europhys. Lett

References in corpus (5)

• Unexpected Behavior of the Local Compressibility Near the B=0 Metal-Insulator Transition
• Thermodynamic Signature of a Two-Dimensional Metal-Insulator Transition
• A new quantum phase between the Fermi glass and the Wigner crystal in two dimensions
• Metallic low-temperature resistivity in 2D over an extended temperature range
• Delocalized Coulomb phase in two dimensions

Cited by in corpus (6)

• Role of a parallel magnetic field in two dimensional disordered clusters containing a few correlated electrons
• The Parallel Magnetoconductance of Interacting Electrons in a Two Dimensional Disordered System
• Delocalization due to correlations in two-dimensional disordered systems
• Persistent currents in two dimensions: New regimes induced by the interplay between electronic correlations and disorder
• Ground state of a partially melted Wigner molecule
• From the Fermi Liquid Towards the Wigner Solid in Two Dimensions