Noise spectrum of quantum transport through quantum dots: a combined effect of non-Markovian and cotunneling processes

TL;DR

This paper develops a comprehensive quantum transport theory to analyze noise spectra in quantum dots, revealing how non-Markovian and cotunneling effects create characteristic features that can be tuned via voltage adjustments.

Contribution

It introduces an exact master equation and a full-frequency noise spectrum formalism for quantum transport, highlighting the combined effects of non-Markovian and cotunneling processes.

Findings

Noise spectra exhibit characteristic steps and peak-dips.

Peak-dips result from non-Markovian and cotunneling effects.

Voltage tuning modulates Rabi resonance signatures.

Abstract

Based on our recently developed quantum transport theory in term of an exact master equation, the corresponding particle-number resolved ($n$-resolved) master equation and the related shot noise spectrum formalism covering the full frequency range are constructed. We demonstrate that the noise spectra of transport current through single quantum dot and double quantum dots show characteristic steps and/or peak-dips in different tunneling frequency regimes through tuning the applied bias voltage and/or gate voltage at low temperatures. The peak-dips crossing the tunneling resonant frequencies is a combination effect of non-Markovian and cotunneling processes. These voltage-dependent tunneling resonance characteristics can be utilized to effectively modulate the internal Rabi resonance signature in the noise spectrum.