Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene

Handle URI:
http://hdl.handle.net/10754/315783
Title:
Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene
Authors:
Tahir, M.; Sabeeh, K.; Schwingenschlögl, Udo ( 0000-0003-4179-7231 ) ; Shaukat, A.
Abstract:
Since the discovery of graphene, a lot of interest has been attracted by the zeroth Landau level, which has no analog in the conventional two dimensional electron gas. Recently, lifting of the spin and valley degeneracies has been confirmed experimentally by capacitance measurements, while in transport experiments, this is difficult due to the scattering in the device. In this context, we model interaction effects on the quantum capacitance of graphene in the presence of a perpendicular magnetic field, finding good agreement with experiments. We demonstrate that the valley degeneracy is lifted by the substrate and by Kekule distortion, whereas the spin degeneracy is lifted by Zeeman interaction. The two cases can be distinguished by capacitance measurements.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Computational Physics and Materials Science (CPMS)
Citation:
Tahir M, Sabeeh K, Shaukat A, Schwingenschlögl U (2013) Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene. Journal of Applied Physics 114: 223711. doi:10.1063/1.4842755.
Publisher:
AIP Publishing
Journal:
Journal of Applied Physics
Issue Date:
10-Dec-2013
DOI:
10.1063/1.4842755
Type:
Article
ISSN:
00218979
Additional Links:
http://scitation.aip.org/content/aip/journal/jap/114/22/10.1063/1.4842755
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Computational Physics and Materials Science (CPMS)

Full metadata record

DC FieldValue Language
dc.contributor.authorTahir, M.en
dc.contributor.authorSabeeh, K.en
dc.contributor.authorSchwingenschlögl, Udoen
dc.contributor.authorShaukat, A.en
dc.date.accessioned2014-04-13T14:37:58Z-
dc.date.available2014-04-13T14:37:58Z-
dc.date.issued2013-12-10en
dc.identifier.citationTahir M, Sabeeh K, Shaukat A, Schwingenschlögl U (2013) Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene. Journal of Applied Physics 114: 223711. doi:10.1063/1.4842755.en
dc.identifier.issn00218979en
dc.identifier.doi10.1063/1.4842755en
dc.identifier.urihttp://hdl.handle.net/10754/315783en
dc.description.abstractSince the discovery of graphene, a lot of interest has been attracted by the zeroth Landau level, which has no analog in the conventional two dimensional electron gas. Recently, lifting of the spin and valley degeneracies has been confirmed experimentally by capacitance measurements, while in transport experiments, this is difficult due to the scattering in the device. In this context, we model interaction effects on the quantum capacitance of graphene in the presence of a perpendicular magnetic field, finding good agreement with experiments. We demonstrate that the valley degeneracy is lifted by the substrate and by Kekule distortion, whereas the spin degeneracy is lifted by Zeeman interaction. The two cases can be distinguished by capacitance measurements.en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/jap/114/22/10.1063/1.4842755en
dc.rightsArchived with thanks to Journal of Applied Physicsen
dc.titleTheory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in grapheneen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentComputational Physics and Materials Science (CPMS)en
dc.identifier.journalJournal of Applied Physicsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Physics, University of Sargodha, Sargodha 40100, Pakistanen
dc.contributor.institutionDepartment of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistanen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorTahir, Muhammaden
kaust.authorSchwingenschlögl, Udoen
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