{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/32120"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/32120","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"h/e magnetic flux modulation of the energy gap in nanotube quantum dots","abstract":"We have studied the energy spectrum of multiwall carbon nanotubes using differential conductance measurements. The carbon nanotubes act as the Coulomb island of a single electron tunneling transistor. Temperature dependence of the conductivity curves shows that the electron wave functions extend between electrodes, and the energy levels are well-defined so they can be traced. Differential conductivity maps of the tubes are obtained as functions of the coaxial magnetic field, as well as of the perpendicular field. The maps for coaxial magnetic field show that a conductivity gap is induced as a function of the magnetic field, and the gap oscillates with a period of h/e, similar to that of Ajiki-Ando gap modulations. Ajiki and Ando predicted that a magnetic field can cause inter-conversion between metallic and semiconducting behavior of carbon nanotubes. Similarly, the measured density of states of the tubes also has a period of h/e. Tight binding calculations of carbon nanotube band structure are compared to the data.","abstract_html":"We have studied the energy spectrum of multiwall carbon nanotubes using differential conductance measurements. The carbon nanotubes act as the Coulomb island of a single electron tunneling transistor. Temperature dependence of the conductivity curves shows that the electron wave functions extend between electrodes, and the energy levels are well-defined so they can be traced. Differential conductivity maps of the tubes are obtained as functions of the coaxial magnetic field, as well as of the perpendicular field. The maps for coaxial magnetic field show that a conductivity gap is induced as a function of the magnetic field, and the gap oscillates with a period of h/e, similar to that of Ajiki-Ando gap modulations. Ajiki and Ando predicted that a magnetic field can cause inter-conversion between metallic and semiconducting behavior of carbon nanotubes. Similarly, the measured density of states of the tubes also has a period of h/e. Tight binding calculations of carbon nanotube band structure are compared to the data.","abstract_has_math":false,"creators":["Coskun, Ulas Cosar"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Bezryadin, Alexey"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-07-05T21:15:21Z","date_published":"2012-07-05T21:15:21Z","updated_at":"2026-07-22T22:25:30Z","subjects":["multiwall carbon nanotubes","conductivity","Ajiki-Ando gap modulations","carbon nanotube band structure"],"languages":["en"],"rights":["©2005 Coskun"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["Q. 620.5 Tc5c","FILM 2005 C82"],"render_values":[{"text":"Q. 620.5 Tc5c","href":null,"code":true},{"text":"FILM 2005 C82","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/32120","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bezryadin, Alexey"]},{"key":"dc:creator","label":"Author","values":["Coskun, Ulas Cosar"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-07-05T21:15:21Z","10000-01-01","2005"]},{"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":["multiwall carbon nanotubes","conductivity","Ajiki-Ando gap modulations","carbon nanotube band structure"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["©2005 Coskun"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["Q. 620.5 Tc5c","FILM 2005 C82","http://hdl.handle.net/2142/32120"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have studied the energy spectrum of multiwall carbon nanotubes using differential conductance measurements. The carbon nanotubes act as the Coulomb island of a single electron tunneling transistor. Temperature dependence of the conductivity curves shows that the electron wave functions extend between electrodes, and the energy levels are well-defined so they can be traced. Differential conductivity maps of the tubes are obtained as functions of the coaxial magnetic field, as well as of the perpendicular field. The maps for coaxial magnetic field show that a conductivity gap is induced as a function of the magnetic field, and the gap oscillates with a period of h/e, similar to that of Ajiki-Ando gap modulations. Ajiki and Ando predicted that a magnetic field can cause inter-conversion between metallic and semiconducting behavior of carbon nanotubes. Similarly, the measured density of states of the tubes also has a period of h/e. Tight binding calculations of carbon nanotube band structure are compared to the data.","Submitted by Rachelle Ramer (rramer2@illinois.edu) on 2012-07-05T21:15:21Z No. of bitstreams: 1 Coskun.pdf: 5141604 bytes, checksum: 1aaceff9991c56c42ff357798381aa53 (MD5)","Made available in DSpace on 2012-07-05T21:15:21Z (GMT). No. of bitstreams: 1 Coskun.pdf: 5141604 bytes, checksum: 1aaceff9991c56c42ff357798381aa53 (MD5) Previous issue date: 2005","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Rachelle Ramer (rramer2@illinois.edu) on 2012-07-05T21:15:21Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:05-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: thesis/dissertation","thesis/dissertation","U of I Only"]},{"key":"dc:title","label":"Title","values":["h/e magnetic flux modulation of the energy gap in nanotube quantum dots"]}]}],"canonical_facts":{"dc:contributor":["Bezryadin, Alexey"],"dc:creator":["Coskun, Ulas Cosar"],"dc:date":["2012-07-05T21:15:21Z","10000-01-01","2005"],"dc:description":["We have studied the energy spectrum of multiwall carbon nanotubes using differential conductance measurements. The carbon nanotubes act as the Coulomb island of a single electron tunneling transistor. Temperature dependence of the conductivity curves shows that the electron wave functions extend between electrodes, and the energy levels are well-defined so they can be traced. Differential conductivity maps of the tubes are obtained as functions of the coaxial magnetic field, as well as of the perpendicular field. The maps for coaxial magnetic field show that a conductivity gap is induced as a function of the magnetic field, and the gap oscillates with a period of h/e, similar to that of Ajiki-Ando gap modulations. Ajiki and Ando predicted that a magnetic field can cause inter-conversion between metallic and semiconducting behavior of carbon nanotubes. Similarly, the measured density of states of the tubes also has a period of h/e. Tight binding calculations of carbon nanotube band structure are compared to the data.","Submitted by Rachelle Ramer (rramer2@illinois.edu) on 2012-07-05T21:15:21Z No. of bitstreams: 1 Coskun.pdf: 5141604 bytes, checksum: 1aaceff9991c56c42ff357798381aa53 (MD5)","Made available in DSpace on 2012-07-05T21:15:21Z (GMT). No. of bitstreams: 1 Coskun.pdf: 5141604 bytes, checksum: 1aaceff9991c56c42ff357798381aa53 (MD5) Previous issue date: 2005","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Rachelle Ramer (rramer2@illinois.edu) on 2012-07-05T21:15:21Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:05-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: thesis/dissertation","thesis/dissertation","U of I Only"],"dc:identifier":["Q. 620.5 Tc5c","FILM 2005 C82","http://hdl.handle.net/2142/32120"],"dc:language":["en"],"dc:rights":["©2005 Coskun"],"dc:subject":["multiwall carbon nanotubes","conductivity","Ajiki-Ando gap modulations","carbon nanotube band structure"],"dc:title":["h/e magnetic flux modulation of the energy gap in nanotube quantum dots"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:30Z"}