Current noise of a resonant tunnel junction coupled to a nanomechanical oscillator

TL;DR

This paper provides a theoretical analysis of current noise in a resonant tunnel junction coupled to a nanomechanical oscillator, revealing how oscillator-electron interactions influence transport properties and noise characteristics.

Contribution

It introduces a non-perturbative theoretical framework to analyze current noise and phonon distributions in such coupled systems, advancing understanding of quantum nanomechanical effects.

Findings

Significant features in current-voltage characteristics due to oscillator coupling

Shot noise and Fano factor are affected by bias voltage and coupling strength

Insights into quantum behavior of nanomechanical oscillators in electronic transport

Abstract

We present a theoretical study of current noise of a resonant tunnel junction coupled to a nanomechanical oscillator within the non-equilibrium Green's function technique. An arbitrary voltage is applied to the tunnel junction and electrons in the leads are considered to be at zero temperature. The properties of the phonon distribution of the nanomechanical oscillator strongly coupled to the electrons on the dot are investigated using a non-perturbative approach. An analytical calculations and numerical results for the current-voltage, shot noise and the corresponding Fano factor as a function of applied bias show significant features of the nanomechanical oscillator coupling dynamics. This will provide useful insight for the design of experiments aimed at studying the quantum behavior of an oscillator.