Theoretical investigations for shot noise in correlated resonant tunneling through a quantum coupled system

TL;DR

This paper provides a theoretical analysis of shot noise in electron tunneling through a two-level quantum system with coherent coupling, using advanced quantum rate equations to explore effects in different tunneling scenarios.

Contribution

It generalizes the generation-recombination approach to include quantum coherence effects in shot noise analysis of two-terminal tunneling devices.

Findings

Analytical and numerical results for shot noise in quantum dots with ferromagnetic leads.

Insights into shot noise behavior in series quantum dot systems.

Effects of bias-voltage and frequency on shot noise characteristics.

Abstract

In this paper, we carry out a theoretical analysis of the zero-frequency and finite-frequency shot noise in electron tunneling through a two-level interacting system connected to two leads, when a coherent coupling between the two levels is present, by means of recently developed bias-voltage and temperature dependent quantum rate equations. For this purpose, we generalize the traditional generation-recombination approach for shot noise of two-terminal tunneling devices properly to take into account the coherent superposition of different electronic states (quantum effects). As applications, analytical and numerical investigations have been given in detail for two cases: (1) electron tunneling through a quantum dot connected to ferromagnetic leads with intradot spin-flip scattering, and (2) spinless fermions tunneling through seriesly coupled quantum dots, focusing on the shot noise as functions of bias-voltage and frequency.