Anisotropic Electron-Phonon Coupling in Rb-Intercalated Bilayer Graphene

作者：Kleeman James^*; Sugawara Katsuaki; Sato Takafumi; Takahashi Takashi

来源：Journal of the Physical Society of Japan, 2014, 83(12): 124715.

DOI：10.7566/JPSJ.83.124715

We have performed high-resolution angle-resolved photoemission spectroscopy on Rb-intercalated bilayer graphene, which is regarded as the thinnest limit of Rb-intercalated graphite (Rb-GIC). We have clearly observed a velocity renormalization of the pi* bands near the Fermi level, and electron doping from Rb atoms to the graphene layers. We attribute the renormalization to strong coupling of electrons with graphene's in-plane optical phonon mode. The electron-phonon coupling constant has been measured, and found to exhibit a strong momentum anisotropy similar to that of bulk GIC superconductors. This result provides evidence for universal electron-phonon coupling in intercalated multi-layer graphene and bulk GICs.

• 出版日期2014-12-15