Transport through a Strongly Correlated Quantum-Dot with Fano Interference

TL;DR

This paper investigates how Fano interference and Kondo effects influence electron transport in a strongly correlated quantum dot system, revealing non-trivial conductance and noise behaviors at low temperatures.

Contribution

It introduces a detailed analysis of transport properties considering both Kondo effects and Fano interference using slave boson mean field theory.

Findings

Transport deviates from the unitary limit due to interdot coupling.

Zero bias shot noise Fano factor increases with interdot coupling.

Fano factor exhibits non-monotonic behavior with interdot coupling.

Abstract

We present the transport properties of a strongly correlated quantum dot attached to two leads with a side coupled non-interacting quantum dot. Transport properties are analyzed using the slave boson mean field theory which is reliable in the zero temperature and low bias regime. It is found that the transport properties are determined by the interplay of two fundamental physical phenomena,i.e. the Kondo effects and the Fano interference. The linear conductance will depart from the unitary limit and the zero bias anomaly will be suppressed in the presence of interdot coupling. The zero bias shot noise Fano factor increases with the interdot coupling and tends to the Poisson value. The shot noise Fano factor shows a non-monotonic behavior as a function of the interdot coupling for various side dot energy levels.