Direct observation of miniband-edge singularities in the optical spectra of GaAs/AlAs superlattices

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Published
1994-01-15
Resource Type
journal article
Rights Information
  • Copyright © 1994 American Physical Society
DOI
  • 10.1103/physrevb.49.1809
Publisher
Published for the American Physical Society by the American Institute of Physics

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Description

Band-edge optical transitions in GaAs/AlAs superlattices with different miniband widths are investigated by low-temperature-photocurrent, photoluminescence-excitation, and reflectance spectroscopy. Direct spectroscopic evidence is given for excitonic effects at saddle-type critical points which are related to M(1) Van Hove singularities at the upper miniband edges, for both heavy-hole and light-hole excitons. Excellent agreement is obtained between the observed transition energies and the miniband widths deduced from Kronig-Penney model calculations.

Journal

  • Physical review B. Condensed matter

    Physical review B. Condensed matter 49 (3), 1809-1802, 1994-01-15

    Published for the American Physical Society by the American Institute of Physics

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