Effective mass of electrons and holes in bilayer graphene

Electron-hole asymmetry and electron-electron interaction

K. Zou, X. Hong, Jun Zhu

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Precision measurements of the effective mass m* in high-quality bilayer graphene using the temperature dependence of the Shubnikov-de Haas oscillations are reported. In the density range 0.7×1012 < n < 4.1×1012 cm-2, both the hole mass mh* and the electron mass me* increase with increasing density, demonstrating the hyperbolic nature of the bands. The hole mass mh* is approximately 20-30% larger than the electron mass me*. Tight-binding calculations provide a good description of the electron-hole asymmetry and yield an accurate measure of the interlayer hopping parameter v4=0.063. Both mh* and me* are suppressed compared with single-particle values, suggesting renormalization of the band structure of bilayer graphene induced by electron-electron interaction.

Original languageEnglish (US)
Article number085408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number8
DOIs
StatePublished - Aug 22 2011

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Electron-electron interactions
Graphite
Graphene
graphene
electron scattering
electron mass
asymmetry
Electrons
electrons
Band structure
interlayers
temperature dependence
oscillations
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Effective mass of electrons and holes in bilayer graphene: Electron-hole asymmetry and electron-electron interaction",
abstract = "Precision measurements of the effective mass m* in high-quality bilayer graphene using the temperature dependence of the Shubnikov-de Haas oscillations are reported. In the density range 0.7×1012 < n < 4.1×1012 cm-2, both the hole mass mh* and the electron mass me* increase with increasing density, demonstrating the hyperbolic nature of the bands. The hole mass mh* is approximately 20-30{\%} larger than the electron mass me*. Tight-binding calculations provide a good description of the electron-hole asymmetry and yield an accurate measure of the interlayer hopping parameter v4=0.063. Both mh* and me* are suppressed compared with single-particle values, suggesting renormalization of the band structure of bilayer graphene induced by electron-electron interaction.",
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