Topologically protected zero modes in twisted bilayer graphene

Article

关键词: SCANNING-TUNNELING-MICROSCOPY;    GRAPHITE;   

DOI  :  10.1103/PhysRevB.84.045436

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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