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https://hdl.handle.net/2142/25797
Description
Title
Piezoreflectance of gallium arsenide
Author(s)
Wells, James Everett
Issue Date
1969
Doctoral Committee Chair(s)
Handler, Paul
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
piezoreflectance
Gallium Arsenide (GaAs)
reflectivity spectrum
single crystal GaAs
Language
en
Abstract
The response of the reflectivity spectrum of single crystal
GaAs to uniaxial stress in the (001) and (111) directions was determined.
Interband transitions were detected at 1.425 t .015, 1.76 t .02, 2.89,
3.12, and 4.5 eVe
The two lowest energy transitions are shown compatible with
r symmetry, and the Pikus and Bir deformation potential ratio d/b ~ 3.2
is determined. Second harmonic response at 1.4 eV is shown in agreement
with a rigid shift model for the strain perturbation.
The 2.89 and 3.12 eV transitions exhibit modulated reflectivity
lineshapes expected of A symmetry. Comparison is made with the stressmodulated
response of a symmetry-related transition in germanium. The
deformation potential ratios, D1/5
/Dl/l = -.55 ± .03, D35/D33 = .77 ± .03,
have been derived. Comparison of the hydrostatic component of the perturbation
with the energy derivative of the unmodulated reflectivity
spectrum shows good agreement with a rigid shift model.
Finally, the 4.5 eV transition has shown a response to the
strain perturbation indicative of a Delta symmetry.
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