{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/30731"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/30731","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Model for an exciton mechanism of superconductivity in planar geometry","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.\"","abstract_html":""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."","abstract_has_math":false,"creators":["Allender, David William"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Bardeen, John"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-04-22T17:32:12Z","date_published":"2012-04-22T17:32:12Z","updated_at":"2026-07-22T22:25:29Z","subjects":["exciton mechanism","superconductivity","planar geometry"],"languages":["en"],"rights":["Copyright 1975 David W. Allender"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["2168096"],"render_values":[{"text":"2168096","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/30731","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bardeen, John"]},{"key":"dc:creator","label":"Author","values":["Allender, David William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-04-22T17:32:12Z","10000-01-01","1975"]},{"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."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["exciton mechanism","superconductivity","planar geometry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1975 David W. Allender"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/30731","2168096"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"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.\"","Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:32:11Z No. of bitstreams: 1 1975_allender.pdf: 2767546 bytes, checksum: a2753072f34896ecbbc7b6234e669908 (MD5)","Made available in DSpace on 2012-04-22T17:32:12Z (GMT). No. of bitstreams: 1 1975_allender.pdf: 2767546 bytes, checksum: a2753072f34896ecbbc7b6234e669908 (MD5) Previous issue date: 1975","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:32:12Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:34:30-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Model for an exciton mechanism of superconductivity in planar geometry"]}]}],"canonical_facts":{"dc:contributor":["Bardeen, John"],"dc:creator":["Allender, David William"],"dc:date":["2012-04-22T17:32:12Z","10000-01-01","1975"],"dc:description":["\"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.\"","Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:32:11Z No. of bitstreams: 1 1975_allender.pdf: 2767546 bytes, checksum: a2753072f34896ecbbc7b6234e669908 (MD5)","Made available in DSpace on 2012-04-22T17:32:12Z (GMT). No. of bitstreams: 1 1975_allender.pdf: 2767546 bytes, checksum: a2753072f34896ecbbc7b6234e669908 (MD5) Previous issue date: 1975","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Weathers (weathrs2@illinois.edu) on 2012-04-22T17:32:12Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:34:30-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["http://hdl.handle.net/2142/30731","2168096"],"dc:language":["en"],"dc:rights":["Copyright 1975 David W. Allender"],"dc:subject":["exciton mechanism","superconductivity","planar geometry"],"dc:title":["Model for an exciton mechanism of superconductivity in planar geometry"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:29Z"}