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 language | English (US) |
|---|---|
| Article number | 085408 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 84 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 22 2011 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Effective mass of electrons and holes in bilayer graphene : Electron-hole asymmetry and electron-electron interaction. / Zou, K.; Hong, X.; Zhu, Jun.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 8, 085408, 22.08.2011.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effective mass of electrons and holes in bilayer graphene
T2 - Electron-hole asymmetry and electron-electron interaction
AU - Zou, K.
AU - Hong, X.
AU - Zhu, Jun
PY - 2011/8/22
Y1 - 2011/8/22
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevB.84.085408
DO - 10.1103/PhysRevB.84.085408
M3 - Article
VL - 84
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 8
M1 - 085408
ER -