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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. PSE Division, KAUST, Thuwal 23955-6900 (Saudi Arabia)
  2. (Pakistan)
  3. Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
  4. Department of Physics, University of Sargodha, Sargodha 40100 (Pakistan)
Publication Date:
OSTI Identifier:
22266160
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CAPACITANCE; ELECTRON GAS; ELECTRON-PHONON COUPLING; GRAPHENE; MAGNETIC FIELDS; SCATTERING; SPIN; SUBSTRATES; ZEEMAN EFFECT