Anisotropic energy gap induced by charge density wave in kagome superconductors AV<sub>3</sub>Sb<sub>5</sub>

ORAL

Abstract

We have investigated the electronic structure of kagome superconductor AV3Sb5 by high-resolution angle-resolved photoemission spectroscopy (ARPES) [1,2], and observed multi-orbital nature of the valence-band structure in AV3Sb5. Our high-resolution measurements also revealed a drastic electronic reconstruction and an energy gap opening triggered by the charge-density-wave (CDW) transition. In this talk, we will show temperature and hν dependence of band structure across TCDW, and discuss the origin of CDW in terms of the electronic structure.

[1] K. Nakayama, T. Kato et al., Phys. Rev. B, in press (arXiv:2104.08042v2). [2] T. Kato et al., submitted.

*This work was supported by JST-CREST (No. JPMJCR18T1), JST-PRESTO (No. JPMJPR18L7), Grant-in-Aid for Scientific Research (JSPS KAKENHI Grant Numbers JP21H04435 and JP20H01847), UVSOR (Proposal number: 21-658 and 21-679), the National Key R&D Program of China Grant No. 2020YFA0308800), the Natural Science Foundation of China (Grants No. 92065109, No. 11734003, and No. 12061131002), the Beijing Natural Science Foundation (Grant No. Z190006), the Beijing Institute of Technology (BIT) Research Fund Program for Young Scholars (Grant No. 3180012222011), GP-Spin at Tohoku University, and the Analysis & Testing Center at BIT.

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Publication: [1] K. Nakayama, T. Kato et al., Phys. Rev. B, in press (arXiv:2104.08042v2).
[2] T. Kato et al., submitted.

Presenters

  • Takemi Kato

    • Tohoku University

Authors

  • Takemi Kato

    • Tohoku University

  • Yongkai Li

    • Beijing Institute of Technology

  • Tappei Kawakami

    • Tohoku University

  • Min Liu

    • Beijing Institute of Technology

  • Kosuke Nakayama

    • Tohoku University

  • Zhiwei Wang

    • Beijing Institute of Technology

  • Ayumi Moriya

    • Tohoku University

  • Kiyohisa Tanaka

    • Institute for Molecular Science

  • Takashi Takahashi

    • Tohoku University

  • Yugui Yao

    • Beijing Institute of Technology

  • T. Sato

    • Tohoku University
    • Dept. Physics, CSRN, WPI-AIMR, SRIS, Tohoku Univ.