Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices

Article

关键词: SQUARE LATTICE;    SUPERCONDUCTORS;    TRANSITIONS;    SALTS;   

DOI  :  10.1103/PhysRevB.80.165110

来源: SCIE

【 摘 要 】

The interplay between long-range and local Coulomb repulsions 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.

【 授权许可】

Free