Many-body effects on intersubband resonances in narrow InAs/AlSb quantum wells

Jianzhong Li, C. Z. Ning

Research output: Contribution to journalConference article

Abstract

Intersubband polarization couples to collective excitations of the interacting electron gas confined in a semiconductor quantum well (QW) structure. Such excitations include correlated pair excitations (repellons) and intersubband plasmons. The oscillator strength of intersubband resonances (ISBRs) strongly varies with QW parameters and electron density because of this coupling. Using the intersubband semiconductor Bloch equations for a two-conduction-subband model, we show that intersubband absorption spectra for narrow wells are dominated by the Fermi-edge singularity (via coupling to repellons) when the electron gas becomes degenerate and in the presence of large nonparabolicity. Thus the resonance peak position appears at the Fermi edge and the peak is greatly narrowed, enhanced, and red shifted as compared to the free particle result. Our results uncover a new perspective for ISBRs and indicate the necessity of proper many-body theoretical treatment in order for modeling and prediction of ISBR line shape.

Original languageEnglish (US)
Pages (from-to)264-267
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume20
Issue number3-4
DOIs
StatePublished - Jan 1 2004
Externally publishedYes
EventProceedings of the 11th International Conference on Narrow Gap - Buffalo, NY., United States
Duration: Jun 16 2003Jun 20 2003

Keywords

  • Intersubband resonance
  • Many-body effects
  • Nonparabolicity
  • Quantum wells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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