Current noise in a irradiated point contact

TL;DR

This paper introduces a new method to calculate current noise spectra in a quantum point contact affected by classical fields, revealing characteristic noise features under specific conditions.

Contribution

The paper presents a novel scattering state approach for analyzing current noise in irradiated quantum point contacts, neglecting electron-electron interactions.

Findings

Identified a narrow peak in current noise spectra at frequency less than T and V.

Demonstrated the approach's effectiveness in modeling noise in ballistic quantum contacts.

Provided insights into the spectral features of current noise under weak random irradiation.

Abstract

We propose a new approach to calculate current and current correlations in a ballistic quantum point contact interacting with a classical field. The approach is based on the concept of scattering states for a time dependent Hamiltonian neglecting electron-electron interaction. Using this approach we calculated the spectra of the current noise in a biased point contact irradiated by a weak random field. For typical radiation frequencies \nu less than the temperature T and the bias voltage V we find a narrow peak of width \nu on top of a broad background of width \max (T,eV).