Anisotropic transport in quantum wires embedded in (110) plane

TL;DR

This paper theoretically examines how Coulomb and spin-orbit interactions influence anisotropic electrical transport in (110) plane semiconductor quantum wires, revealing enhanced anisotropy in dc conductivity and persistent ac anisotropy useful for characterizing SOI strengths.

Contribution

It provides a theoretical analysis of Coulomb and spin-orbit effects on anisotropic transport in quantum wires, highlighting differences between infinite and finite length wires.

Findings

Coulomb interaction enhances dc conductivity anisotropy in infinite wires.

Finite-length wires show smeared dc anisotropy but retain ac anisotropic behavior.

Ac conductivity can be used to distinguish Rashba and Dresselhaus SOI strengths.

Abstract

We investigate theoretically the effects of the Coulomb interaction and spin-orbit interactions (SOIs) on the anisotropic transport property of semiconductor quantum wires embedded in (110) plane. The anisotropy of the dc conductivity can be enhanced significantly by the Coulomb interaction for infinite-long quantum wires. But it is smeared out in quantum wires with finite length, while the ac conductivity still shows anisotropic behavior, from which one can detect and distinguish the strengths of the Rashba SOI and Dresselhaus SOI.