Exciton dimensionality and confinement studied by resonant Raman scattering in GaAs/AlxGa1-xAs Bragg-confining structures and superlattices

M. Zahler, E. Cohen, J. Salzman, E. Linder, E. Maayan, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The LO-phonon resonant Raman scattering is studied in GaAs/Al0.32Ga0.68As Bragg-confining structures at low temperatures. Comparative studies are made on a GaAs/Al0.32Ga0.68As superlattice and on a bulk Al0.3Ga0.7As crystal. A strong scattering intensity is observed in the spectral range of the (eB:hhB)1S, (eB:lhB)1S Bragg-confined excitions and the (e1:hh1)1S superlattice exciton. The Raman profiles, namely, the scattering intensity versus exciting laser energy (in the respective spectral ranges) are characterized by a large outgoing-beam/incoming-beam intensity ratio. These profiles are analyzed in terms of a model based on exciton confinement, on the anisotropy of its 1S wave function (which defines its dimensionality), and on its scattering by interface and alloy potential fluctuations. The (eB:hhB)1S exciton is thus found to be virtually two-dimensional, while the (eB:lhB)1S and (e1:hh1)1S excitons are intermediate between two and three dimensions. The dimensionality is found to be related to the degree of confinement.

Original languageEnglish (US)
Pages (from-to)5305-5315
Number of pages11
JournalPhysical Review B
Volume50
Issue number8
DOIs
StatePublished - 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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