Nonlinear dynamics in superlattices driven by high frequency ac-fields

TL;DR

This paper explores how electron-electron interactions can mitigate decoherence in nanodevices driven by high-frequency fields, revealing mechanisms that preserve quantum coherence despite structural disorder.

Contribution

It demonstrates that considering electron-electron interactions is crucial for accurately understanding decoherence in superlattices under high-frequency excitation.

Findings

Electron-electron interactions reduce decoherence effects.

Disorder-induced dephasing can be overestimated without interactions.

Conditions for observing quantum coherence are discussed.

Abstract

We investigate the dynamical processes taking place in nanodevices driven by high-frequency electromagnetic fields. We want to elucidate the role of different mechanisms that could lead to loss of quantum coherence. Our results show how the dephasing effects of disorder that destroy after some periods coherent oscillations, such as Rabi oscillations, can be overestimated if we do not consider the electron-electron interactions that can reduce dramatically the decoherence effects of the structural imperfections. Experimental conditions for the observation of the predicted effects are discussed.