Low Temperature Terahertz Nano Imaging of WTe2 Thin Film

ORAL

Abstract

We discuss the development of cryogenic scanning near-field microscope suitable for nano-scale imaging and spectroscopy at terahertz frequency range with the spatial resolution below 130 nm[1]. We report terahertz near-field measurement of WTe2 thin film of 1 to 3 layers[2] above and below the metal-insulator transition. Clear contrast in near-field signal can be observed among regions with different layer numbers and between metallic and insulating state.
[1] Stinson, H. T., et al. "Infrared nanospectroscopy and imaging of collective superfluid excitations in anisotropic superconductors." Physical Review B 90.1 (2014): 014502.
[2] Fei, Zaiyao, et al. "Edge conduction in monolayer WTe 2." Nature Physics 13.7 (2017): 677.

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Presenters

  • Ran Jing

    • Department of Physics, Columbia University
    • Physics, Columbia University

Authors

  • Ran Jing

    • Department of Physics, Columbia University
    • Physics, Columbia University

  • Yinming Shao

    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University

  • Zaiyao Fei

    • University of Washington
    • Physics, University of Washington, Seattle
    • Department of Physics, University of Washington

  • Xiaodong Xu

    • University of Washington
    • Department of Physics, University of Washington
    • University of Washington, Seattle

  • Dimitri Basov

    • Department of Physics, Columbia University in the City of New York
    • Department of Physics, Columbia University, New York 10027
    • department of physics, columbia university
    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University