Quantum capacitance and compressibility of graphene: The role of Coulomb interactions

Abstract

Many-body effects on quantum capacitance, compressibility, renormalized Fermi velocity, kinetic and interaction energies of massless Dirac electrons in graphene, induced by the Coulomb interactions, are analyzed theoretically in the first-order, Hartree-Fock and random phase approximations. Recent experimental data on quantum capacitance and renormalized Fermi velocity are analyzed and compared with the theory. The bare Fermi velocity and the effective dielectric constants are obtained from the experimental data. A combined effect of Coulomb interactions and Gaussian fluctuations of disorder potential is considered.

9 pages, 9 figures; insets to Figs. 6, 9 and some additional explanations were added

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Cited by in corpus (2)

• Many-body effects of Coulomb interaction on Landau levels in graphene
• Dynamic negative capacitance regime in GeTe Rashba ferroelectric