Signatures of trions in the optical spectra of doped semiconductor nanorings in a magnetic field

Torsten Meier, P. Thomas, S. W. Koch, K. Maschke

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

A density-matrix theory for absorption changes in semiconductors induced by electron or hole occupations is outlined. Bound and unbound trions are included via four-point correlation functions representing electron-hole pair transitions in the presence of carrier populations. The spectra calculated for semiconductor nanorings show bleaching of the exciton resonance and induced absorption at energies corresponding to transitions to bound and unboand trion states. Without a magnetic field, induced absorption below the exciton line due to bound negatively (positively) charged trions appears when the two electrons (holes) of the trion are in different bands. A magnetic field introduces characteristic modifications of the spectra that can be attributed to the Aharonov-Bohm effect. It may lead to the formation of additional bound magneto-trion states.

Original languageEnglish (US)
Pages (from-to)283-293
Number of pages11
JournalPhysica Status Solidi (B) Basic Research
Volume234
Issue number1
DOIs
StatePublished - Nov 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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