Doctoral Dissertations

Abstract

"The coupling of free carriers and lattice vibrational modes is studied in CdS and InSb by room temperature far infrared reflectance measurements. When the free carrier concentration is such that the plasma frequency is at or near the longitudinal optical mode frequency it is shown that while the transverse modes remain fixed, the longitudinal modes mix with the plasma mode and are shifted in a manner similar to that described by Varga in 1965. Using the dielectric function for the coupled system permits the determination of electron effective masses by reflectance measurements with lattice effects excluded. This method allows one to investigate the frequency shifts and effective mass values on crystals in which the mobility varies by more than an order of magnitude as demonstrated by the analysis of both CdS and InSb. In the case of CdS where the polaron coupling constant is large enough to have noticeable effects, account is taken of the polaron mass and of the additional absorption in the plasma mode at frequencies above the longitudinal optical phonon frequency"--Abstract, page i.

Advisor(s)

Bell, Robert John, 1934-

Committee Member(s)

Hultside, Roland A.
Parks, William F.
Foote, Joe R.
Hill, Otto H.
Gerson, Robert, 1923-2013
Tefft, Wayne E., 1929-1973

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

United States. Bureau of Mines

Publisher

University of Missouri--Rolla

Publication Date

1969

Pagination

iv, 52 pages

Note about bibliography

Includes bibliographical references (pages 46-48).

Rights

© 1969 Thomas Joseph McMahon, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Lattice dynamics
Nanostructures -- Optical properties
Phonons
Plasmons (Physics)

Thesis Number

T 2231

Print OCLC #

6007172

Electronic OCLC #

806959830

Included in

Physics Commons

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