Broadband terahertz study of excitonic resonances in the high-density regime in GaAs/AlxGa1-xAs quantum wells

Rupert Huber, Robert A. Kaindl, Ben A. Schmid, Daniel S. Chemla

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We report the first terahertz study of the intraexcitonic 1s-2p transition at high excitation densities in GaAs/AlxGa1-xAs quantum wells. A strong shift, broadening, and ultimately the disappearance of this resonance occurs with increasing density, after ultrafast photoexcitation at the near-infrared exciton line. Densities of excitons and unbound electron-hole pairs are followed quantitatively using a model of the composite terahertz dielectric response. Comparison with near-infrared absorption changes reveals a significantly enhanced energy shift and broadening of the intraexcitonic resonance.

Original languageEnglish (US)
Article number161314
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number16
DOIs
StatePublished - Oct 15 2005
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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