Insulator-Metal Transition in One Dimension Induced by Long-Range Electronic Interactions

TL;DR

This paper investigates how long-range electronic interactions induce an insulator-to-metal transition in a one-dimensional charge density wave system, revealing a metallic state with significant optical conductivity.

Contribution

It demonstrates that increasing the range of electron-electron repulsion causes a transition from insulating to metallic behavior in a 1D CDW system using numerical methods.

Findings

Transition to metallic ground state with increased interaction range

Large Drude weight in optical conductivity of the metallic phase

Discussion of possible interpretations of the transition

Abstract

The effects of a long range electronic potential on a one dimensional commensurate Charge Density Wave (CDW) state are investigated. Using numerical techniques it is shown that a transition to a metallic ground state is reached as the range of the electron-electron repulsion increases. In this metallic state, the optical conductivity exhibits a large Drude weight. Possible interpretations of our results are discussed.