Tunneling effects on impurity spectral function in coupled asymmetric quantum wires

TL;DR

This paper investigates how tunneling effects influence the impurity spectral function in coupled asymmetric quantum wires, revealing additional spectral peaks caused by anisotropy and finite temperature effects.

Contribution

It introduces the impact of anisotropy-induced tunneling effects on the impurity spectral function in coupled quantum wires at finite temperatures.

Findings

Non-diagonal spectral function elements arise from anisotropy.

Tunneling effects produce extra peaks in the spectral function.

Pronounced peaks persist up to 20 K temperature.

Abstract

The impurity spectral function is studied in coupled double quantum wires at finite temperatures. Simple anisotropy in the confinement direction of the wires leads to finite non-diagonal elements of the impurity spectral function matrix. These non-diagonal elements are responsible for tunneling effects and result in pronounced extra peak in the impurity spectral function up to temperatures as high as 20 K.