镱驱动的石墨烯中电子-声子耦合的强增强
Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
摘要：
我们提出了高分辨率的角度分辨光电子能谱研究结合第一性原理计算，探讨如何在石墨烯中的电子与声子的相互作用被修改的Yb的存在。我们发现从Yb到石墨烯层的转移电荷与石墨烯$π$带杂化，导致电子-声子相互作用的强烈增强。具体地，相对于生长的石墨烯（$\leq$ 0.05），在引入Yb时，电子-声子耦合常数增加多达10倍。所观察到的耦合常数构成了石墨烯有史以来测量的最高值，并表明石墨烯和吸附原子之间的杂化可能是实现超导石墨烯的关键参数。
英文摘要：
We present high-resolution angle-resolved photoemission spectroscopy study in conjunction with first principles calculations to investigate how the interaction of electrons with phonons in graphene is modified by the presence of Yb. We find that the transferred charges from Yb to the graphene layer hybridize with the graphene $π$ bands, leading to a strong enhancement of the electron-phonon interaction. Specifically, the electron-phonon coupling constant is increased by as much as a factor of 10 upon the introduction of Yb with respect to as grown graphene ($\leq$0.05). The observed coupling constant constitutes the highest value ever measured for graphene and suggests that the hybridization between graphene and the adatoms might be a critical parameter in realizing superconducting graphene.
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