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.

*The work was supported by NSF, DOE, the Welch Foundation, and NSFC.

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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