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Visualizing Type-II Weyl Points in Tungsten Ditelluride by Quasiparticle Interference.

Chun-Liang Lin1, Ryuichi Arafune2, Ro-Ya Liu3

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Summary

Tungsten ditelluride (WTe2) is confirmed as a type-II Weyl semimetal (WSM). Researchers used quasiparticle interference to pinpoint Weyl points and their connection to Fermi arc surface states in WTe2.

Keywords:
Fermi arcWTe2Weyl semimetalsquasiparticle interferencescanning tunneling microscopytopological mattertransition metal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Weyl semimetals (WSMs) are topological materials with unique electronic properties.
  • Type-II WSMs, like tungsten ditelluride (WTe2), are theoretically predicted but experimentally challenging to confirm.
  • Previous studies were limited by Weyl points being above the Fermi level, hindering direct observation of Fermi arc surface states.

Purpose of the Study:

  • To provide experimental evidence confirming WTe2 as a type-II Weyl semimetal.
  • To identify the precise location of Weyl points in WTe2.
  • To elucidate the connection between Weyl points and Fermi arc surface states.

Main Methods:

  • Utilized cryogenic scanning tunneling microscopy (STM).
  • Measured energy-dependent quasiparticle interference (QPI) patterns.
  • Analyzed QPI data to determine electronic structure and topological features.

Main Results:

  • Experimental confirmation of WTe2 as a type-II Weyl semimetal.
  • Direct observation of Weyl point locations.
  • Established the link between Weyl points and Fermi arc surface states, consistent with theoretical predictions.

Conclusions:

  • WTe2 is experimentally verified as a type-II Weyl semimetal.
  • The study resolves key questions about WTe2's topological nature.
  • Findings encourage further research into type-II WSMs and their properties.