Field-controlled suppression of phonon-induced transitions in coupled quantum dots

TL;DR

This paper demonstrates how external magnetic and electric fields can significantly control phonon-induced transition rates in coupled quantum dots, impacting quantum device performance.

Contribution

It provides a detailed calculation of phonon scattering rates in coupled quantum dots under external fields using a realistic 3D model and Fermi golden rule.

Findings

External fields modulate electron state lifetimes

Phonon scattering rates can be strongly suppressed or enhanced

Results applicable to realistic quantum dot devices

Abstract

We calculate the longitudinal-acoustic phonon scattering rate for a vertical double quantum dot system with weak lateral confinement and show that a strong modulation of the single-electron excited states lifetime can be induced by an external magnetic or electric field. The results are obtained for typical realistic devices using a Fermi golden rule approach and a three-dimensional description of the electronic quantum states.