Model for an exciton mechanism of superconductivity in planar geometry
Allender, David William
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https://hdl.handle.net/2142/30731
Description
Title
Model for an exciton mechanism of superconductivity in planar geometry
Author(s)
Allender, David William
Issue Date
1975
Doctoral Committee Chair(s)
Bardeen, John
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
exciton mechanism
superconductivity
planar geometry
Language
en
Abstract
"The possibility of an exciton mechanism of superconductivity in planar geometry is investigated in this thesis. Upon specialization to the case of the single interface between a thin, crystalline metal film in intimate contact with a clean semiconductor substrate, a model is developed in which the metal electrons with energies near the Fermi surface penetrate a short distance into the semiconductor. There they scatter by producing and absorbing virtual electron-hole pairs. The effect of such semiconductor polarization processes (i.e., the exciton mechanism) on the electron-electron
interaction is estimated by two separate means and is found to lead to an attractive interaction for favorable choices of semiconductor and metal materials. A brief look at attempts to derive these results in terms of
the microscopic dielectric function is also given~ A calculation of what
superconducting transition temperatures one could expect to see due to this effect follows, both for the case of the exciton mechanism acting alone; and for the case of the exciton mechanism combined with the usual
phononmechanism~· It is"" concluded that although the exciton mechanism has
not yet been established experimentally, the theory has a sound physical basis and indicates that the effect of the exciton mechanism ought to be observable in"" favorable samples with sufficient effort. The immediate need is to fabricate such systems and establish the existence of the exciton mechanism of superconductivity."
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