{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/84085"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/84085","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Quantum Theory of Glasses","abstract":"The quantum excitations in glasses have long presented a set of puzzles for condensed matter scientists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. This thesis suggests a radical revision of this picture. We argue that the excitations in low temperature glasses are deeply connected to the energy landscape of the glass when it vitrifies: the excitations are not low excited states built on a single ground state but locally defined resonances, high in the energy spectrum of a solid. Two level systems involve resonant collective tunneling motions of around two hundred molecular units. The Boson Peak and the plateau in thermal conductuvity, observed at higher temperatures, arise from the same motions but the motions are no longer fully coherent.","abstract_html":"The quantum excitations in glasses have long presented a set of puzzles for condensed matter scientists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. This thesis suggests a radical revision of this picture. We argue that the excitations in low temperature glasses are deeply connected to the energy landscape of the glass when it vitrifies: the excitations are not low excited states built on a single ground state but locally defined resonances, high in the energy spectrum of a solid. Two level systems involve resonant collective tunneling motions of around two hundred molecular units. The Boson Peak and the plateau in thermal conductuvity, observed at higher temperatures, arise from the same motions but the motions are no longer fully coherent.","abstract_has_math":false,"creators":["Lubchenko, Vassiliy"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Wolynes, Peter G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T22:12:47Z","date_published":"2015-09-25T22:12:47Z","updated_at":"2026-07-22T22:26:22Z","subjects":["Chemistry, Physical"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3070376"],"render_values":[{"text":"(MiAaPQ)AAI3070376","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/84085","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wolynes, Peter G."]},{"key":"dc:creator","label":"Author","values":["Lubchenko, Vassiliy"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T22:12:47Z","10000-01-01","2002"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"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":["Chemistry, Physical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/84085","(MiAaPQ)AAI3070376"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The quantum excitations in glasses have long presented a set of puzzles for condensed matter scientists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. This thesis suggests a radical revision of this picture. We argue that the excitations in low temperature glasses are deeply connected to the energy landscape of the glass when it vitrifies: the excitations are not low excited states built on a single ground state but locally defined resonances, high in the energy spectrum of a solid. Two level systems involve resonant collective tunneling motions of around two hundred molecular units. The Boson Peak and the plateau in thermal conductuvity, observed at higher temperatures, arise from the same motions but the motions are no longer fully coherent.","Made available in DSpace on 2015-09-25T22:12:47Z (GMT). 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A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. This thesis suggests a radical revision of this picture. We argue that the excitations in low temperature glasses are deeply connected to the energy landscape of the glass when it vitrifies: the excitations are not low excited states built on a single ground state but locally defined resonances, high in the energy spectrum of a solid. Two level systems involve resonant collective tunneling motions of around two hundred molecular units. The Boson Peak and the plateau in thermal conductuvity, observed at higher temperatures, arise from the same motions but the motions are no longer fully coherent.","Made available in DSpace on 2015-09-25T22:12:47Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3070376.pdf: 4647429 bytes, checksum: 34184ddca419d79d4c7d406c9026c50c (MD5) Previous issue date: 2002","Embargo set by: Seth Robbins for item 85366 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","81 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002."],"dc:identifier":["http://hdl.handle.net/2142/84085","(MiAaPQ)AAI3070376"],"dc:language":["eng"],"dc:subject":["Chemistry, Physical"],"dc:title":["Quantum Theory of Glasses"],"dc:type":["text"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:22Z"}