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