Observation of a van Hove singularity of a surface Fermi arc with prominent coupling to phonons in a Weyl semimetal

Zhenyu Wang, Cheng Yi Huang, Chia Hsiu Hsu, Hiromasa Namiki, Tay Rong Chang, Feng Chuan Chuang, Hsin Lin, Takao Sasagawa, Vidya Madhavan, Yoshinori Okada

Research output: Contribution to journalArticlepeer-review

Abstract

A van der Waals coupled Weyl semimetal Formula Presented is investigated by combining scanning tunneling microscopy/spectroscopy and first-principles calculations. We observe a sharp peak in the tunneling conductance near the Fermi energy (Formula Presented). Comparison with calculations indicates that the peak originates from a van Hove singularity (vHs) associated with a Lifshitz transition of the surface Fermi-arc state. Interestingly, our tunneling spectroscopy also shows signatures of strong electron-boson coupling. This is potentially due to an anomalously enhanced charge susceptibility coming from the near-Formula Presented vHs formation.

Original languageEnglish (US)
Article number075110
JournalPhysical Review B
Volume105
Issue number7
DOIs
StatePublished - Feb 15 2022
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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