Drumhead surface state in ZrSiTe probed by scanning tunneling microscopy

ORAL

Abstract

The family of materials ZrSiX (X = S, Se, Te) are topological nodal-line semimetals characterized by linear band crossings in 1-dimensional lines or loops in momentum space, rather than discrete points as in Dirac or Weyl semimetals. ZrSiTe has a non-symmorphic crystal symmetry, protecting nodal lines at high symmetry lines in the Brillouin zone (BZ). ZrSiTe is host to four nodal lines, two of which form loops in the BZ, one encircling gamma and the other encircling Z, and the other two forming lines that extend through the BZ. It was theoretically predicted that in the surface projection of ZrSiTe, the area between the nodal loops would contain a drumhead state, an exotic, topologically protected 2-dimensional surface state that links the nodal loops together [1]. Surface states have long been probed by scanning tunneling microscopy (STM) using quasiparticle interference (QPI) measurements, and have also been able to provide additional information on the topological nature of these states. Here, we show the first observed signature of electronic scattering within the drumhead state using low-temperature STM and QPI measurements.

[1] Muechler et al., arXiv:1909.02154

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Presenters

  • Seokhwan Choi

    • Stewart Blusson Quantum Matter Institute, University of British Columbia

Authors

  • Brandon A Stuart

    • Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Seokhwan Choi

    • Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Jisun Kim

    • Department of Physics & Astronomy, Louisiana State University
    • University of British Columbia
    • Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Raquel Queiroz

    • Weizmann Institute of Science
    • Department of Condensed Matter Physics, Weizmann Institute of Science

  • Lukas Muechler

    • Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA
    • Center for Computational Quantum Physics, Flatiron Institute
    • Center for Computational Quantum Physics, The Flatiron Institute

  • Leslie Schoop

    • Princeton University
    • Department of Chemistry, Princeton University
    • Princeton

  • Douglas Andrew Bonn

    • University of British Columbia
    • Department of Physics & Astronomy, University of British Columbia
    • Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Sarah A Burke

    • Stewart Blusson Quantum Matter Institute, University of British Columbia
    • University of British Columbia