Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices

Simone Fratini (1) , J. Merino (2)

1 NEEL - TMC - Théorie de la Matière Condensée
2 UAM - Universidad Autónoma de Madrid

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.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Simone Fratini, J. Merino. Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2009, 80, pp.165110. ⟨10.1103/PhysRevB.80.165110⟩. ⟨hal-00704613⟩