Published February 25, 2021 | Version v1
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Type-III Dirac fermions in HfxZr1-xTe2 topological semimetal candidate

  • 1. National Centre of Scientific Research Demokritos: Athens, GR
  • 2. Department of Mechanical Engineering, University of West Attica, 12241 Athens, Greece

Description

Topological semimetals host interesting new types of low-energy quasiparticles such as type-I and type-II Dirac and Weyl fermions. Type-III topological semimetals can emerge exactly at the border between type-I and II, characterized by a line-like Fermi surface and a flat energy dispersion near the topological band crossing. Here, we theoretically predict that 1T-HfTe2 and 1T-ZrTe2 transition metal dichalcogenides are type-I and type-II DSMs, respectively. By alloying the two materials, a new HfxZr1-xTe2 alloy with type-III Dirac cone emerges at x=0.2, in combination with 1% in-plane compressive strain. By imaging the electronic energy bands with in-situ angle-resolved photoemission spectroscopy of this random alloy with the desired composition, grown by molecular beam epitaxy on InAs(111) substrates, we provide experimental evidence that the tοp of type-III Dirac cone lies at -or very close-to-the Fermi level.

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Related works

Is previous version of
Journal article: 10.1063/5.0038799 (DOI)

Funding

SKYTOP – Skyrmion-Topological insulator and Weyl semimetal technology 824123
European Commission