Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices

Abstract

The interplay between long-range and local Coulomb repulsion in strongly interacting electron systems is explored through a two-dimensional Hubbard-Wigner model. An unconventional metallic state is found in which collective low-energy excitations characteristic of the Wigner crystal induce a flow of electrical current despite the absence of one-electron spectral weight at the Fermi surface. Photoemission experiments on certain quarter-filled layered molecular crystals should observe a gap in the excitation spectrum whereas optical spectroscopy should find a finite Drude weight indicating metallic behavior.

10 pages, accepted for publication in PRB

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• Doping driven metal-insulator transitions and charge orderings in the extended Hubbard model
• Wigner crystallization in topological flat bands
• Pseudogap metal induced by long-range Coulomb interactions
• Collective excitation of a short-range charge ordering in $\theta$-$\mbox{(BEDT-TTF)}_2\mbox{CsZn(SCN)}_4$
• Orbital physics of polar Fermi molecules
• Spectroscopy of two-dimensional interacting lattice electrons using symmetry-aware neural backflow transformations
• Finite Temperature Properties of Geometrically Charge Frustrated Systems
• The role of potassium orbitals in the metallic behavior of K3picene
• Paramagnetic phases of strongly correlated ultracold fermions coupled to an optical cavity