Date of Award

Fall 1985

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Browning, Lary M.

Second Advisor

Mendelson, Kenneth S.

Third Advisor

Pedrotti, Frank L.

Abstract

The goal of this thesis is to obtain expressions relating the deformation potentials of the valence band, with those of the acceptor 's first and second excited states, including the cubic terms. Unstressed acceptor states are taken from Baldereschi and Lipari(1970) and symmetry adapted for the site symmetry of Germanium. The symmetry acceptor states are perturbed by a stress Hamiltonian and expressions relating the deformation potentials of the Bloch functions are related to the deformation potentials of the acceptor excited states. These relations explain why some acceptor states split in different ways than other acceptor states or Bloch states of the valence band. This splitting is due to the symmetry of the pure crystal being reduced by a uniaxial stress, and the splitting is observed experimentally. So far no theory has been able to explain this peculiar behavior of the acceptor states splitting under uniaxial stress.

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