Spin-dependent coherent transport of two-dimensional excitons

TL;DR

This paper develops a theoretical framework for understanding how spin interactions influence interference effects in the diffusion of two-dimensional excitons, predicting localization or antilocalization behaviors based on system parameters.

Contribution

It introduces a comprehensive theory accounting for four spin states and their interplay with exchange interactions, advancing understanding of exciton transport phenomena.

Findings

Interference effects depend on spin splittings and exchange interactions.

Localization or antilocalization can be predicted from system parameters.

Experimental signatures of exciton interference are discussed.

Abstract

We propose a theory of interference contributions to the two-dimensional exciton diffusion coefficient. The theory takes into account four spin states of the heavy-hole exciton. An interplay of the single particle, electron and hole, spin splittings with the electron-hole exchange interaction gives rise to either localization or antilocalization behavior of excitons depending on the system parameters. Possible experimental manifestations of exciton interference are discussed.