{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23941"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23941","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Universal conductance fluctuations, glassy kinetics, and 1/f noise","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Garfunkel, Glen Adam"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Weissman, Michael B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-18T15:52:57Z","date_published":"2011-05-18T15:52:57Z","updated_at":"2026-07-22T22:25:22Z","subjects":["universal conductance fluctuations","glassy kinetics","1/f noise","disordered metallic systems","CCu","SiAu"],"languages":["en"],"rights":["1989 Glen Adam Garfunkel"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["3473765"],"render_values":[{"text":"3473765","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23941","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Weissman, Michael B."]},{"key":"dc:creator","label":"Author","values":["Garfunkel, Glen Adam"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-18T15:52:57Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["universal conductance fluctuations","glassy kinetics","1/f noise","disordered metallic systems","CCu","SiAu"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1989 Glen Adam Garfunkel"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["3473765","http://hdl.handle.net/2142/23941"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-18T15:52:57Z No. of bitstreams: 1 1989_garfunkel.pdf: 9223125 bytes, checksum: 80ef732fd8e2d5e1615d1b433d10be9e (MD5)","Made available in DSpace on 2011-05-18T15:52:57Z (GMT). No. of bitstreams: 1 1989_garfunkel.pdf: 9223125 bytes, checksum: 80ef732fd8e2d5e1615d1b433d10be9e (MD5) Previous issue date: 1989","Restriction data tranferred 2014-07-01T11:14:00-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-18T15:52:57Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Universal conductance fluctuations, glassy kinetics, and 1/f noise"]}]}],"canonical_facts":{"dc:contributor":["Weissman, Michael B."],"dc:creator":["Garfunkel, Glen Adam"],"dc:date":["2011-05-18T15:52:57Z","10000-01-01","1989"],"dc:description":["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.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-18T15:52:57Z No. of bitstreams: 1 1989_garfunkel.pdf: 9223125 bytes, checksum: 80ef732fd8e2d5e1615d1b433d10be9e (MD5)","Made available in DSpace on 2011-05-18T15:52:57Z (GMT). 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