Nonlinear edge conduction in monolayer WTe2

ORAL

Abstract

Monolayer WTe$_{\mathrm{2}}$ was recently predicted to have an inverted band structure, giving rise to helical edge states degenerate with bulk bands. [Qian \textit{et al.} Science 346, 1344-1347 (2014)] Although it is expected to be semimetal, experimentally we find insulating behavior in the bulk below approximately 100 K, while edge conduction remains. At lower temperatures (below \textasciitilde 20 K) we often observe a pronounced dip in the edge conductance at zero bias which is highly gate dependent. I will discuss our recent progress on understanding this zero bias anomaly through its bias voltage, gate, length, temperature, and magnetic field dependence. Possible effects of the contacts, magnetic scatterers in the edge, and electron correlations will be discussed.

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Authors

  • Tauno Palomaki

    University of Washington

  • Zaiyao Fei

    University of Washington

  • Wenjin Zhao

    University of Washington

  • Paul Nguyen

    University of Washington

  • Bosong Sun

    University of Washington

  • Xiaodong Xu

    University of Wasington, University of Washington, Univ of Washington, Department of Physics, University of Washington, University of Washington, Seattle, USA.

  • David Cobden

    Department of Physics, University of Washington, Department of Physics, University of Washington, Seattle, WA 98195, USA, Univ of Washington, University of Washington