Possible Kondo Behaviors in Moiré Patterned 2M/2H Mixed Phase WS<sub>2</sub>

ORAL

Abstract

Transition metal dichalcogenide (TMD) heterostructures have recently garnered excitement as platforms to study strongly correlated physics in low dimensional limits. With the wide variety of the polymorphic structures allowed in TMDs, these heterostructures provide a new route to engineer material properties. Here, we present scanning tunneling microscopy and spectroscopy (STM/S) observations on Moiré pattern regions of exfoliated mixed phase 2M/2H WS2 flakes. We examine the dI/dV spectra measured on a non-trivial Moiré pattern with features resembling the strongly correlated system. Kondo-like peak features are observed in the dI/dV spectra near zero bias and undergo a dramatic transition near 7.5 K, near the superconducting transition temperature of 2M WS2 (~8.5 K). In addition, stripe-like Moiré patterns are observed and are determined to be caused by twisting 2M WS2 bilayers. This type of Moiré pattern may provide a platform to observe Luttinger liquids in the one-dimensional strongly correlated regions. These observations show that the polymorphic heterostructures of TMDs can provide rich structural combinations to exhibit novel physics.

*This work is funded by: DoE DE-SC0021281 for sample preparation, NSF 2228841 for STM measurements, NASA Grant #80NSSC20M113 for supporting W.R.S.

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Presenters

  • William R Scougale

    • University of Wyoming

Authors

  • William R Scougale

    • University of Wyoming

  • Piumi I Samarawickrama

    • University of Wyoming

  • Joseph McBride

    • Department of Chemistry, University of Wyoming
    • University of Wyoming

  • Wenyong Wang

    • Department of Physics and Astronomy, University of Wyoming
    • University of Wyoming

  • Brian Leonard

    • Department of Chemistry, University of Wyoming
    • University of Wyoming

  • John Ackerman

    • Department of Chemical Engineering, University of Wyoming & Resonance Sciences, Beaver Creek Oh
    • Department of Chemical Engineering, University of Wyoming
    • University of Wyoming, Department of Chemical Engineering
    • University of Wyoming

  • Jifa Tian

    • University of Wyoming

  • TeYu Chien

    • University of Wyoming