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  • Letter

Polarity-dependent charge density wave in the kagome superconductor CsV3Sb5

Takemi Kato1,*, Yongkai Li2,3,4,*, Kosuke Nakayama1,5,†, Zhiwei Wang2,3,4,‡, Seigo Souma6,7, Miho Kitamura8, Koji Horiba8,9, Hiroshi Kumigashira10, Takashi Takahashi1,7 et al.

Takafumi Sato1,6,7,11,§

  • 1Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
  • 2Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, People's Republic of China
  • 3Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing 100081, People's Republic of China
  • 4Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314011, People's Republic of China
  • 5Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
  • 6Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
  • 7Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
  • 8Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • 9National Institutes for Quantum Science and Technology (QST), Sendai 980-8579, Japan
  • 10Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan
  • 11International Center for Synchrotron Radiation Innovation Smart (SRIS), Tohoku University, Sendai 980-8577, Japan

  • *These authors contributed equally to this work.
  • †k.nakayama@arpes.phys.tohoku.ac.jp
  • ‡zhiweiwang@bit.edu.cn
  • §t-sato@arpes.phys.tohoku.ac.jp
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Phys. Rev. B 106, L121112 – Published 23 September, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L121112

Abstract

Polar surface and interface play pivotal roles for realizing exotic properties of materials, and search for such polar states is of crucial importance for expanding materials' functionality. Here we report microfocused angle-resolved photoemission spectroscopy of CsV3Sb5, a member of recently discovered kagome superconductors AV3Sb5 (A = K, Rb, and Cs) and show evidence for the polar nature of the cleaved surface which is characterized by Cs- and Sb-terminated surfaces with markedly different fermiology. The Cs-terminated surface shows intriguing doubling of V-derived bands at low temperatures associated with the band folding due to the three-dimensional charge density wave (CDW), whereas the Sb-terminated one shows no band doubling or resultant CDW-gap opening indicative of the suppression of bulk-originated CDW due to polar charge. Such polar-surface-dependent band structures must be incorporated for understanding the origin of unconventional superconducting and charge order at the surface of AV3Sb5.

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Phys. Rev. B 106, L121112– Published 23 September, 2022
  • Received 25 April 2022
  • Revised 14 August 2022
  • Accepted 12 September 2022
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