Asymmetric Quantum Shot Noise in Quantum Dots

TL;DR

This paper investigates the frequency-dependent shot noise in quantum dots, revealing asymmetric features and super-Poissonian behavior, providing insights into quantum current fluctuations through theoretical analysis.

Contribution

It offers an exact solution for a single level and a perturbative approach for multiple levels, advancing understanding of quantum shot noise in quantum dots.

Findings

Asymmetric shot noise exhibits steps and super-Poissonian behavior.

Provides a theoretical framework for analyzing quantum fluctuations in current.

Offers both exact and perturbative calculations for different quantum dot regimes.

Abstract

We analyze the frequency-dependent noise of a current through a quantum dot which is coupled to Fermi leads and which is in the Coulomb blockade regime. We show that the asymmetric shot noise as function of frequency shows steps and becomes super-Poissonian. This provides experimental access to the quantum fluctuations of the current. We present an exact calculation for a single dot level and a perturbative evaluation of the noise in Born approximation (sequential tunneling regime but without Markov approximation) for the general case of many levels with charging interaction.