Edge states in Graphene: from gapped flat band to gapless chiral modes

ORAL

Abstract

We study edge-states in graphene systems where a bulk energy gap is opened by inversion symmetry breaking. We find that the edge-bands dispersion can be controlled by potentials applied on the boundary row. Under certain boundary potentials, gapless edge-states with valley-dependent velocity are found, exactly analogous to the spin-dependent gapless chiral edge-states in quantum spin Hall systems. The connection of the edge-states to bulk topological properties is revealed.

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Authors

  • Shengyuan Yang

    The University of Texas at Austin, UT Austin Dept of Physics

  • Wang Yao

    The University of Hong Kong, The University of Texas at Austin, The University of Hong Kong

  • Qian Niu

    The university of Texas at Austin, The University of Texas at Austin, UT Austin Dept of Physics, Department of Physics, The University of Texas, Austin, Texas, University of Texas at Austin