Raman investigation of strong quasi-direct optical transitions in ultrathin GaAsAIAs superlattices

Jose Menendez, A. Pinczuk, J. P. Valladares, L. N. Pfeiffer, K. W. West, A. C. Gossard, J. H. English

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigate optical transitions in ultrathin (GaAs)n(AlAs)n superlattices using resonance Raman scattering. For n = 1, 2, we find that superlattice-induced or "quasidirect" transitions have an oscillator strength comparable to bulk-like direct transitions. Theory, on the other hand, predicts the quasidirect transitions to be orders of magnitude weaker. Our results suggest that the discrepancy is due to Γ-X mixing in the conduction band of the superlattices. For bulk-like transitions, we find that the thickness dependence of energy and wavefunction localization disagrees with predictions based on effective-mass theory.

Original languageEnglish (US)
Pages (from-to)65-68
Number of pages4
JournalSurface Science
Volume228
Issue number1-3
DOIs
StatePublished - Apr 1 1990

Fingerprint

Optical transitions
Superlattices
optical transition
superlattices
Wave functions
Conduction bands
Raman scattering
resonance scattering
oscillator strengths
conduction bands
Raman spectra
predictions
gallium arsenide
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Menendez, J., Pinczuk, A., Valladares, J. P., Pfeiffer, L. N., West, K. W., Gossard, A. C., & English, J. H. (1990). Raman investigation of strong quasi-direct optical transitions in ultrathin GaAsAIAs superlattices. Surface Science, 228(1-3), 65-68. https://doi.org/10.1016/0039-6028(90)90260-F

Raman investigation of strong quasi-direct optical transitions in ultrathin GaAsAIAs superlattices. / Menendez, Jose; Pinczuk, A.; Valladares, J. P.; Pfeiffer, L. N.; West, K. W.; Gossard, A. C.; English, J. H.

In: Surface Science, Vol. 228, No. 1-3, 01.04.1990, p. 65-68.

Research output: Contribution to journalArticle

Menendez, J, Pinczuk, A, Valladares, JP, Pfeiffer, LN, West, KW, Gossard, AC & English, JH 1990, 'Raman investigation of strong quasi-direct optical transitions in ultrathin GaAsAIAs superlattices', Surface Science, vol. 228, no. 1-3, pp. 65-68. https://doi.org/10.1016/0039-6028(90)90260-F
Menendez, Jose ; Pinczuk, A. ; Valladares, J. P. ; Pfeiffer, L. N. ; West, K. W. ; Gossard, A. C. ; English, J. H. / Raman investigation of strong quasi-direct optical transitions in ultrathin GaAsAIAs superlattices. In: Surface Science. 1990 ; Vol. 228, No. 1-3. pp. 65-68.
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