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

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

doi:10.1103/physrevb.105.075110

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

Journal Article · 04 February 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.105.075110 · OSTI ID:1979720

Wang, Zhenyu ^[1]; Huang, Cheng-Yi ^[2];

^[3];

^[4]; Chang, Tay-Rong ^[5];

^[6];

^[7]; Sasagawa, Takao ^[4]; Madhavan, Vidya ^[8];

^[9]

University of Science and Technology of China, Hefei (China); University of Illinois at Urbana-Champaign, IL (United States); OSTI
Institute of Physics, Academia Sinica, Taipei (Taiwan)
Okinawa Institute of Science and Technology (OIST), Okinawa (Japan); National Sun Yat-sen University, Kaohsiung (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
Tokyo Institute of Technology (Japan)
National Cheng Kung University, Tainan (Taiwan); Center for Quantum Frontiers of Research and Technology (QFort), Tainan, Taiwan; National Center for Theoretical Sciences, Taipei (Taiwan)
National Sun Yat-sen University, Kaohsiung (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
Institute of Physics, Academia Sinica, Taipei (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
University of Illinois at Urbana-Champaign, IL (United States)
Okinawa Institute of Science and Technology (OIST), Okinawa (Japan)

A van der Waals coupled Weyl semimetal NbIrTe₄ is investigated by combining scanning tunneling microscopy/spectroscopy and first-principles calculations. Here we observe a sharp peak in the tunneling conductance near the Fermi energy (E_F). 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-E_F vHs formation.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Natural Science Foundation of China; Central Universities; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0022101

OSTI ID:: 1979720

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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