Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene
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Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene.pdf
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ArticleKAUST Department
Computational Physics and Materials Science (CPMS)Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2013-12-11Online Publication Date
2013-12-11Print Publication Date
2013-12-14Permanent link to this record
http://hdl.handle.net/10754/315783
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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.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 PublishingJournal
Journal of Applied Physicsae974a485f413a2113503eed53cd6c53
10.1063/1.4842755