University of Illinois Urbana-Champaign

Universal conductance fluctuations, glassy kinetics, and 1/f noise

Garfunkel, Glen Adam

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https://hdl.handle.net/2142/21241

Description

Title
Universal conductance fluctuations, glassy kinetics, and 1/f noise
Author(s)
Garfunkel, Glen Adam
Issue Date
1989
Doctoral Committee Chair(s)
Weissman, Michael B.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
  • The 1/f noise in strongly disordered metallic CCu and SiAu systems was studied in the temperature range 2-300 K. The temperature, frequency, and electric and magnetic field dependencies were found to be consistent with the predictions of the universal conductance fluctuation theory in the low temperature regime.
  • Statistical properties of the noise in these systems were also studied in specially fabricated nanometer scale samples. Non-Gaussian effects and other aspects of the noise in these samples were used to probe the kinetics of the low energy excitations. In the range 4-30 K ample evidence was found of spectral features and 2 level and 3 level switching events with both tunneling and activated kinetics. This is the first observation of individual low energy excitations in amorphous metallic conductors. The noise in a majority of the systems exhibited anomalous non-Gaussian effects not consistent with a picture of randomly fluctuating independent two level systems.
Type of Resource
text
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http://hdl.handle.net/2142/21241
Copyright and License Information
Copyright 1989 Garfunkel, Glen Adam

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