论文标题
用ytterbium装饰的石墨烯中电子音波耦合和电子 - 电子相互作用的伴随增强
Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
论文作者
论文摘要
电子 - 电子相互作用与电子 - 音波耦合之间的相互作用一直是石墨烯中的关键问题之一，因为它可以提供有关外国原子在石墨烯中增强的电子 - phonon耦合的信息。在SIC底物上的YTTERBIUM装饰石墨烯中，与随种植的石墨烯相比，电子偶联表现出强大的增强。基于角度分辨光发性研究，还发现Ytterbium的存在导致费米速度的降低，从而揭示了费米液体理论中电子电子相互作用的增强。我们对电子 - 电子相互作用和电子 - 音波耦合的伴随增强的发现表明，在用异源原子装饰的石墨烯中两种代表性的多体相互作用之间的相互作用可能性。
The interplay between electron-electron interaction and electron-phonon coupling has been one of the key issues in graphene as it can provide information on the origin of enhanced electron-phonon coupling in graphene by foreign atoms. In ytterbium-decorated graphene on SiC substrate, electron-phonon coupling exhibits strong enhancement compared to that of as-grown graphene. Based on angle-resolved photoemission study, the presence of ytterbium is also found to result in the decrease of Fermi velocity, revealing the enhancement of electron-electron interaction within the Fermi liquid theory. Our finding on the concomitant enhancement of electron-electron interaction and electron-phonon coupling suggests a possibility of the interplay between the two representative many-body interactions in graphene decorated with foreign atoms.
