期刊
PHYSICAL REVIEW B
卷 84, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.045436
关键词
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资金
- ANR [ANR-09-NANO-016]
- Ecole Doctorale de Physique de la Region Parisienne [ED 107]
- US Department of Energy [DE-FG02-08ER46512]
- MICINN (Spain) [FIS2008-00124, CONSOLIDER CSD2007-00010]
- U.S. Department of Energy (DOE) [DE-FG02-08ER46512] Funding Source: U.S. Department of Energy (DOE)
We show that a twisted graphene bilayer can reveal unusual topological properties at low energies, as a consequence of a Dirac-point splitting. These features rely on a symmetry analysis of the electron hopping between the two layers of graphene and we derive a simplified effective low-energy Hamiltonian which captures the essential topological properties of a twisted graphene bilayer. The corresponding Landau levels peculiarly reveal a degenerate zero-energy mode which cannot be lifted by strong magnetic fields.
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