Kondo effect in Complex Quantum Dots in the presence of an oscillating and fluctuating gate signal

TL;DR

This paper investigates how oscillating and fluctuating gate signals influence the Kondo effect in complex quantum dots, revealing noise-induced quantum transitions and the conversion of charge signals into current pulses.

Contribution

It introduces a model for the impact of stochastic gate signals on Kondo cotunneling in double and triple quantum dots, highlighting noise-induced quantum state transitions.

Findings

Stochastic signals cause infrared cutoff in Kondo transmission.

Noise induces a transition from SU(4) to SU(2) symmetry in triple quantum dots.

Charge signals can be converted into pulsed Kondo currents.

Abstract

We show how the charge input signal applied to the gate electrode in a double and triple quantum dot may be converted to a pulse in the Kondo cotunneling current being a spin response of a nano-device under a strong Coulomb blockade. The stochastic component of the input signal results in the infrared cutoff of Kondo transmission. The stochastization of the orbital component of the Kondo effect in triple quantum dots results in a noise-induced SU(4) - SU(2) quantum transition.