Coexistence of extended flat band and Kekul\'e order in Li-intercalated graphene
Changhua Bao, Hongyun Zhang, Xi Wu, Shaohua Zhou, Qian Li, Pu Yu, Jia, Li, Wenhui Duan, Shuyun Zhou
TL;DR
This study reports the experimental observation of an extended flat band below the Fermi level in Li-intercalated graphene, revealing simultaneous emergence of flat band and Kekulé order, which opens new avenues for exploring related electronic instabilities.
Contribution
The paper demonstrates the coexistence of an extended flat band and Kekulé order in Li-intercalated graphene, highlighting their simultaneous emergence and potential for studying correlated electronic phenomena.
Findings
Extended flat band observed below E_F in Li-intercalated graphene
Strong electron-phonon interaction evidenced by band dispersion kinks
Simultaneous emergence of flat band and Kekulé order upon Li intercalation
Abstract
Doping graphene near the 1/4 filling to shift the extended flat band and van Hove singularity below E has been highly desirable. Here we report the experimental observation of an extended flat band below E 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 Kekul\'e order emerge simultaneously. Our work provides opportunities for investigating flat band related instabilities and its interplay with the Kekul\'e order
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