Skyrmionic excitons

TL;DR

This paper studies Skyrmionic excitons, revealing they can have higher binding energies than traditional excitons, potentially dominating photoluminescence in certain high-mobility quantum structures.

Contribution

It introduces a variational wave function for Skyrmionic excitons with a good quantum number for total momentum, and analyzes their properties and dispersion relations.

Findings

Skyrmionic excitons can have larger binding energies than magnetoexcitons.

They are likely to dominate photoluminescence spectra in specific quantum well conditions.

The dispersion relation of Skyrmionic excitons is characterized.

Abstract

We investigate the properties of a Skyrmionic exciton consisting of a negatively charged Skyrmion bound to a mobile valence hole. A variational wave function is constructed which has the generalized total momentum P as a good quantum number. It is shown that the Skyrmionic exciton can have a larger binding energy than an ordinary magnetoexciton and should therefore dominate the photoluminescence spectrum in high-mobility quantum wells and heterojunctions where the electron-hole separation exceeds a critical value. The dispersion relation for the Skyrmionic exciton is discussed.