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

doi:10.1103/PhysRevB.105.075110

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 journal › Article › peer-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 language	English (US)
Article number	075110
Journal	Physical Review B
Volume	105
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.105.075110
State	Published - Feb 15 2022

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.105.075110

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

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.",

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doi = "10.1103/PhysRevB.105.075110",

language = "English (US)",

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T1 - Observation of a van Hove singularity of a surface Fermi arc with prominent coupling to phonons in a Weyl semimetal

AU - Wang, Zhenyu

AU - Huang, Cheng Yi

AU - Hsu, Chia Hsiu

AU - Namiki, Hiromasa

AU - Chang, Tay Rong

AU - Chuang, Feng Chuan

AU - Lin, Hsin

AU - Sasagawa, Takao

AU - Madhavan, Vidya

AU - Okada, Yoshinori

PY - 2022/2/15

Y1 - 2022/2/15

N2 - 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.

AB - 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.

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

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