{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23891"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23891","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Some problems on macroscopic quantum phenomena and josephson junctions","abstract":"\"This thesis contains basically two parts. In the' first part, the theory of quantum dynamics of a general particle in fermionic heat baths is considerd. In contrast to the existing work in the literature, we employ a path. integral formalism with fermions being treated in Grassmann algebra. Working on this formalism, we are able to investigate many interesting systems. Our main goal is on the mapping between fermion baths and boson baths. Two major methods are used respectively, and the mapping has been achieved in several practically important cases. The second pari is concemed with the experimental test of macroscopic quantum phenomena in systems of Josephson junc-tion(s). In trying to determine in general the parameters of Josephson junction (this determination is essential for the test), we investigate the bottom pan of the \"\"returnI- V characterisiic of a current-biassed junction. We show that this investigation can indeed lead. to a q~titative determination of the parametel\"\"B. Moreover, we a1so study an imporlant phenomenon associa.ted with the problem, the quantum (as well as classical) fluctuation-induced retrapping, and interesting predictions have been made.\"","abstract_html":""This thesis contains basically two parts. In the' first part, the theory of quantum dynamics of a general particle in fermionic heat baths is considerd. In contrast to the existing work in the literature, we employ a path. integral formalism with fermions being treated in Grassmann algebra. Working on this formalism, we are able to investigate many interesting systems. Our main goal is on the mapping between fermion baths and boson baths. Two major methods are used respectively, and the mapping has been achieved in several practically important cases. The second pari is concemed with the experimental test of macroscopic quantum phenomena in systems of Josephson junc-tion(s). In trying to determine in general the parameters of Josephson junction (this determination is essential for the test), we investigate the bottom pan of the ""returnI- V characterisiic of a current-biassed junction. We show that this investigation can indeed lead. to a q~titative determination of the parametel""B. Moreover, we a1so study an imporlant phenomenon associa.ted with the problem, the quantum (as well as classical) fluctuation-induced retrapping, and interesting predictions have been made."","abstract_has_math":false,"creators":["Chen, Yong-Cong"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Leggett, Anthony J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-16T19:43:51Z","date_published":"2011-05-16T19:43:51Z","updated_at":"2026-07-22T22:25:22Z","subjects":["macroscopic quantum phenomena","Josephson junctions","quantum dynamics"],"languages":["en"],"rights":["1987 Yong-Cong Chen"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["1597088"],"render_values":[{"text":"1597088","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23891","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Leggett, Anthony J."]},{"key":"dc:creator","label":"Author","values":["Chen, Yong-Cong"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-16T19:43:51Z","10000-01-01","1987"]},{"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":["macroscopic quantum phenomena","Josephson junctions","quantum dynamics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1987 Yong-Cong Chen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["1597088","http://hdl.handle.net/2142/23891"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"This thesis contains basically two parts. In the' first part, the theory of quantum dynamics of a general particle in fermionic heat baths is considerd. In contrast to the existing work in the literature, we employ a path. integral formalism with fermions being treated in Grassmann algebra. Working on this formalism, we are able to investigate many interesting systems. Our main goal is on the mapping between fermion baths and boson baths. Two major methods are used respectively, and the mapping has been achieved in several practically important cases. The second pari is concemed with the experimental test of macroscopic quantum phenomena in systems of Josephson junc-tion(s). In trying to determine in general the parameters of Josephson junction (this determination is essential for the test), we investigate the bottom pan of the \"\"returnI- V characterisiic of a current-biassed junction. We show that this investigation can indeed lead. to a q~titative determination of the parametel\"\"B. Moreover, we a1so study an imporlant phenomenon associa.ted with the problem, the quantum (as well as classical) fluctuation-induced retrapping, and interesting predictions have been made.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T19:43:51Z No. of bitstreams: 1 1987_chen.pdf: 4753172 bytes, checksum: 80d7e10cc1ec6dda4795566fe96157ea (MD5)","Made available in DSpace on 2011-05-16T19:43:51Z (GMT). No. of bitstreams: 1 1987_chen.pdf: 4753172 bytes, checksum: 80d7e10cc1ec6dda4795566fe96157ea (MD5) Previous issue date: 1987","Restriction data tranferred 2014-07-01T11:13:43-05:00 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 2011-05-16T19:43:51Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Some problems on macroscopic quantum phenomena and josephson junctions"]}]}],"canonical_facts":{"dc:contributor":["Leggett, Anthony J."],"dc:creator":["Chen, Yong-Cong"],"dc:date":["2011-05-16T19:43:51Z","10000-01-01","1987"],"dc:description":["\"This thesis contains basically two parts. In the' first part, the theory of quantum dynamics of a general particle in fermionic heat baths is considerd. In contrast to the existing work in the literature, we employ a path. integral formalism with fermions being treated in Grassmann algebra. Working on this formalism, we are able to investigate many interesting systems. Our main goal is on the mapping between fermion baths and boson baths. Two major methods are used respectively, and the mapping has been achieved in several practically important cases. The second pari is concemed with the experimental test of macroscopic quantum phenomena in systems of Josephson junc-tion(s). In trying to determine in general the parameters of Josephson junction (this determination is essential for the test), we investigate the bottom pan of the \"\"returnI- V characterisiic of a current-biassed junction. We show that this investigation can indeed lead. to a q~titative determination of the parametel\"\"B. Moreover, we a1so study an imporlant phenomenon associa.ted with the problem, the quantum (as well as classical) fluctuation-induced retrapping, and interesting predictions have been made.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T19:43:51Z No. of bitstreams: 1 1987_chen.pdf: 4753172 bytes, checksum: 80d7e10cc1ec6dda4795566fe96157ea (MD5)","Made available in DSpace on 2011-05-16T19:43:51Z (GMT). No. of bitstreams: 1 1987_chen.pdf: 4753172 bytes, checksum: 80d7e10cc1ec6dda4795566fe96157ea (MD5) Previous issue date: 1987","Restriction data tranferred 2014-07-01T11:13:43-05:00 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 2011-05-16T19:43:51Z Item is restricted indefinitely.","Thesis","U of I Only"],"dc:identifier":["1597088","http://hdl.handle.net/2142/23891"],"dc:language":["en"],"dc:rights":["1987 Yong-Cong Chen"],"dc:subject":["macroscopic quantum phenomena","Josephson junctions","quantum dynamics"],"dc:title":["Some problems on macroscopic quantum phenomena and josephson junctions"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:22Z"}