Self-energy dynamics and the mode-specific phonon threshold effect in Kekule-ordered graphene.

ABSTRACT: Electron-phonon interaction and related self-energy are fundamental to both the equilibrium properties and non-equilibrium relaxation dynamics of solids. Although electron-phonon interaction has been suggested by various time-resolved measurements to be important for the relaxation dynamics of graphene, the lack of energy- and momentum-resolved self-energy dynamics prohibits direct identification of the role of specific phonon modes in the relaxation dynamics. Here, by performing time- and angle-resolved photoemission spectroscopy measurements on Kekulé-ordered graphene with folded Dirac cones at the Γ point, we have succeeded in resolving the self-energy effect induced by the coupling of electrons to two phonons at Ω₁ = 177 meV and Ω₂ = 54 meV, and revealing its dyna

SUBMITTER: Zhang H 

PROVIDER: S-EPMC9155635 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature