Fine structure of excited excitonic states in quantum disks

TL;DR

This paper provides a theoretical analysis of the fine structure of excited excitonic states in semiconductor quantum disks, highlighting the splitting of P-shell levels and potential spin relaxation mechanisms.

Contribution

It introduces a detailed theoretical model of excitonic level splitting in quantum disks, emphasizing the role of electron-hole exchange interaction and phonon-assisted processes.

Findings

P-shell excitonic levels split into three sublevels in quantum disks.

Analytical results derived for strong and weak confinement regimes.

Discussion of exciton spin relaxation via LO-phonon-assisted coupling.

Abstract

We report on a theoretical study of the fine structure of excited excitonic levels in semiconductor quantum disks. A particular attention is paid to the effect of electron-hole long-range exchange interaction. We demonstrate that, even in the axisymmetric quantum disks, the exciton P-shell is split into three sublevels. The analytical results are obtained in the limiting cases of strong and weak confinement. A possibility of exciton spin relaxation due to the resonant LO-phonon-assisted coupling between the P and S shells is discussed.