Coexistence of extended flat band and Kekulé order in Li-intercalated graphene
Changhua Bao, Hong‐Yun Zhang, Xi Wu, Shaohua Zhou, Qian Li, Pu Yu, Jia Li, Wenhui Duan, Shuyun Zhou
Abstract
Heavily doped graphene near $\frac{1}{4}$-filling has attracted intense interest due to the extended flat band which is shifted to the Fermi level with anticipated superconductivity and spin density wave.This work reports progress with the experimental observation of an extended flat band below the Fermi level by Li intercalation of bilayer graphene. Moreover, the Li-intercalated graphene shows interesting coexistence and codevelopment of an extended flat band, Kekul\'e order, and electron-phonon interaction, thereby providing opportunities for investigating their interplay and flat-band-related electronic instabilities.
Topics & Concepts
GrapheneBilayer grapheneCondensed matter physicsFermi levelSuperconductivityElectronic band structureFermi Gamma-ray Space TelescopePhysicsElectronDopingOrder (exchange)Intercalation (chemistry)Materials scienceQuantum mechanicsEconomicsFinanceGraphene research and applicationsQuantum and electron transport phenomenaAdvancements in Battery Materials