Internal Transitions of Two-Dimensional Charged Magneto-Excitons X-: Theory and Experiment

TL;DR

This paper investigates the internal spin transitions of charged excitons in quantum wells under magnetic fields, combining experimental observations with theoretical analysis to reveal new selection rules and complex spectral features.

Contribution

It introduces a novel exact selection rule based on translational invariance for charged complexes in magnetic fields, enhancing understanding of magnetoexciton transitions.

Findings

Observation of double-peak structures in X- transitions

Identification of a new selection rule governing transitions

Theoretical explanation of complex Landau level continua

Abstract

Internal spin-singlet and spin-triplet transitions of charged excitons X- in magnetic fields in quantum wells have been studied experimentally and theoretically. The allowed X- transitions are photoionizing and exhibit a characteristic double-peak structure, which reflects the rich structure of the magnetoexciton continua in higher Landau levels (LL's). We discuss a novel exact selection rule, a hidden manifestation of translational invariance, that governs transitions of charged mobile complexes in a magnetic field.