Phase sensitive noise in quantum dots under periodic perturbation

TL;DR

This paper investigates how periodic perturbations affect noise in chaotic quantum dots, revealing phase-sensitive cusps at specific biases that persist despite averaging, highlighting the interplay between quantum coherence and external driving.

Contribution

It demonstrates that phase-sensitive features in noise spectra of quantum dots persist under averaging, even with rapid periodic perturbations, advancing understanding of quantum transport under dynamic conditions.

Findings

Cusps in noise at bias voltages $V_n=nrac{ ext{h}ar{ u}}{e}$.

Cusps survive averaging despite short perturbation periods.

Noise features depend on phase of time-dependent scattering amplitudes.

Abstract

We evaluate the ensemble averaged noise in a chaotic quantum dot subject to DC bias and a periodic perturbation of frequency $\Omega$. The noise displays cusps at bias $V_n=n\hbar\Omega/e$ that survive the average, even when the period of the perturbation is far shorter than the dwell time in the dot. These features are sensitive to the phase of the time-dependent scattering amplitudes of electrons to pass through the system.