Singlet-triplet dephasing in asymmetric quantum dot molecules

TL;DR

This paper investigates how asymmetry in quantum dot molecules influences the pure dephasing of singlet-triplet states caused by elastic phonon scattering, revealing that only strong asymmetry significantly impacts dephasing rates.

Contribution

It extends previous models to asymmetric double quantum dots, analyzing the effect of asymmetry on singlet-triplet dephasing due to phonons.

Findings

Strong asymmetry is required to notably affect dephasing rates.

Dephasing is primarily influenced by elastic phonon scattering.

Asymmetry has a limited effect unless it is very pronounced.

Abstract

We discuss pure dephasing of singlet-triplet superpositions in two-electron double quantum dots due to elastic phonon scattering. We generalize our previous results to a system built of two non-identical dots. We show that the asymmetry must be very strong in order to considerably affect the dephasing rate.