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https://hdl.handle.net/2142/25761
Description
Title
Excitons in the thallous halides
Author(s)
Bachrach, Robert Zelman
Issue Date
1969
Doctoral Committee Chair(s)
Brown, Frederick C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
excitons
thallous halides
thin film fabrication technique
magneto optical experiments
Language
en
Abstract
A thin film fabrication technique resulting in a considerable
reduction in strain has been developed and has facilitated the optical
and magneto-optical experiments on the Thallous Halides. The strain
reduction achieved has revealed optical spectra of exceptional sharpness,
Previously undiscovered absorption features have appeared and exciton
effects have been established.
A variety of experiments were performed to clarify the nature of
the structure associated with the first exciton peak. Intrinsic
structure and structure due to strain lifted degeneracy has been identified.
These experiments also provided criteria for evaluating the
films.
Analysis of the optical absorption spectra to yield the optical
constants was performed and the spectra correlated with the magnetoabsorption
results. Both Faraday rotation and direct magneto-absorption
experiments were performed. Analysis of the experiments yielded exciton
binding energies, effective reduced and carrier masses, effective g
values, the energy gaps, peak positions and spin orbit splittings.
A phonon sideband to the first exciton peak has been found and
its character extensively investigated. The sideband is believed to
arise from an exciton-longitudinal optical phonon coupled state.
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