Beating in electronic transport through quantum dot based devices

TL;DR

This paper theoretically investigates electronic transport in a two-level quantum dot system driven by external fields, revealing coherent beats in current and TMR, with potential for experimental testing and practical applications.

Contribution

It introduces a theoretical framework for analyzing transport in a tunable double quantum dot system exhibiting coherent beats, combining rate equations, Green functions, and slave-boson methods.

Findings

Coherent beats observed in current and TMR signals.

System tunability allows experimental testing of quantum interference.

Potential practical applications in quantum device engineering.

Abstract

Electronic transport through a two-level system driven by external electric field and coupled to (magnetic or non-magnetic) electron reservoirs is considered theoretically. The basic transport characteristics such as current and tunnel magnetoresistance (TMR) are calculated in the weak coupling approximation by the use of rate equation connected with Green function formalism and slave-boson approach. The time dependent phenomenon is considered in the gradient expansion approximation. The results show that coherent beats pattern can be observed both in current and TMR. The proposed system consisting of two quantum dots attached to external leads, in which the dots' levels can be tuned independently, can be realized experimentally to test this well known physical phenomenon. Finally, we also indicate possible practical applications of such device.