Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1987),
  • paper THJJ1

Band edge absorption spectra of highly excited gallium arsenide

Not Accessible

Your library or personal account may give you access

Abstract

Band edge optical spectra of all direct-gap semiconductors show evidence of electron–hole pair correlation. In sufficiently pure crystals and for low pair densities, n • aB << 1 (where aB is the exciton Bohr radius), one finds discrete individually bound pair states below the fundamental gap energy Egthe excitons—and a strongly enhanced continuum spectrum above Eg. We discuss the characteristic changes in this spectrum induced by the excitation of e–h pairs in the crystal. We concentrate on (1) empirical absorption spectra in the model III–V semiconductor GaAs in the 1013–1016 cm−3 density range at 2 K in conditions of resonant excitation and (2) the concept of dielectric vs metallic screening in nonequilibrium e–h pair distributions. Thin platelets (0.5–4 μm) of high-purity LPE GaAs were excited with tunable picosecond light pulses, the nonlinear absorption was probed with a second independently tunable pulse with ≤6 ps temporal jitter.

© 1987 Optical Society of America

PDF Article
More Like This
Out-of-Equilibrium Two-Phonon Absorption Processes in Gallium Arsenide

E. Cinquanta, L. Gatto, M. Devetta, G. Crippa, S. Stagira, and C. Vozzi
Tu4B.41 International Conference on Ultrafast Phenomena (UP) 2020

Direct observation of femtosecond inter-carrier thermalization in gallium arsenide

C. H. BRITO-CRUZ, R. L. FORK, and C. V. SHANK
TUJJ3 International Quantum Electronics Conference (IQEC) 1987

Photorefractive Two-Beam Coupling with Polarization-Flip in Gallium Arsenide

Tallis Y. Chang, Arthur E.T. Chiou, and Pochi Yeh
WC4 Photorefractive Materials (PR) 1987

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved