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Coexistence of extended flat band and Kekulé order in Li-intercalated graphene

Changhua Bao1,*, Hongyun Zhang1,*, Xi Wu2, Shaohua Zhou1, Qian Li1, Pu Yu1,3, Jia Li2, Wenhui Duan1,3, and Shuyun Zhou1,3,†

  • 1State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
  • 2Shenzhen Geim Graphene Center and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People's Republic of China
  • 3Frontier Science Center for Quantum Information, Beijing 100084, People's Republic of China

  • *These authors contributed equally to this work.
  • †Corresponding author: syzhou@mail.tsinghua.edu.cn
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Phys. Rev. B 105, L161106 – Published 26 April, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L161106

Abstract

Doping graphene near the 1/4-filling to shift the extended flat band and van Hove singularity below EF has been highly desirable. Here we report the experimental observation of an extended flat band below EF in Li-intercalated graphene. Strong electron-phonon interaction is clearly identified by notable kinks in the band dispersion. Moreover, the evolution of the band structure upon Li intercalation shows that the extended flat band and the Kekulé order emerge simultaneously. Our work provides opportunities for investigating flat-band-related instabilities and its interplay with the Kekulé order.

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Phys. Rev. B 105, L161106– Published 26 April, 2022
  • Received 7 September 2021
  • Revised 25 January 2022
  • Accepted 14 April 2022
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