Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices

Details Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices

2009-05-05

arxiv.org/abs/0905.0707v2

Phys. Rev. B 80, 165110 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.80.165110

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.

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