Transport of Indirect Excitons in High Magnetic Fields

TL;DR

This study investigates how indirect excitons in high magnetic fields move over distances, revealing that their transport properties depend on Landau level configurations and magnetic field strength, with implications for understanding exciton dynamics.

Contribution

The paper provides the first spatially- and spectrally-resolved measurements of magnetoexciton transport in high magnetic fields, highlighting the role of Landau levels and magnetic field effects.

Findings

0e-0h indirect magnetoexcitons travel large distances

Transport distance decreases with increasing magnetic field

Energy relaxation and effective mass influence transport behavior

Abstract

We present spatially- and spectrally-resolved photoluminescence measurements of indirect excitons in high magnetic fields. Long indirect exciton lifetimes give the opportunity to measure magnetoexciton transport by optical imaging. Indirect excitons formed from electrons and holes at zeroth Landau levels (0e - 0h indirect magnetoexcitons) travel over large distances and form a ring emission pattern around the excitation spot. In contrast, the spatial profiles of 1e - 1h and 2e - 2h indirect magnetoexciton emission closely follow the laser excitation profile. The 0e - 0h indirect magnetoexciton transport distance reduces with increasing magnetic field. These effects are explained in terms of magnetoexciton energy relaxation and effective mass enhancement.