Electron transport in parallel quantum wires with random potentials

TL;DR

This paper investigates how electron transport in two parallel quantum wires with random potentials is affected by inter-wire interactions and disorder, revealing that these factors influence transport independently and that inter-wire interactions do not significantly impact localization.

Contribution

The study provides new insights into the independent effects of inter-wire interactions and random potentials on electron transport in coupled quantum wires.

Findings

Drude weight is affected independently by inter-wire interaction and disorder.

Inter-wire interactions have minimal impact on Anderson localization.

Transport properties are decoupled from inter-wire interactions in the low energy regime.

Abstract

We study an electron transport property in two parallel quantum wires with random potentials. Assuming the same microscopic parameters for both wires, we focus on the relationship between inter-wire interaction and electron backward scattering by random potentials at low energy regime. Our analytical and numerical calculations show that the Drude weight, a measure of the electron transport, is influenced by inter-wire interaction and random potential independently, and little coupling between those two is observed, which is in contrast to a deep relationship between up- and down-spin interactions and random potentials in a single wire. It leads to that inter-wire interactions do not have a great influence on the Anderson localization in each wire.