Zan Xiaozhou, Guo Xiangdong, Deng Aolin, Huang Zhiheng, Liu Le, Wu Fanfan, Yuan Yalong, Zhao Jiaojiao, Peng Yalin, Li Lu, Zhang Yangkun, Li Xiuzhen, Zhu Jundong, Dong Jingwei, Shi Dongxia, Yang Wei, Yang Xiaoxia, Shi Zhiwen, Du Luojun, Dai Qing, Zhang Guangyu
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China.
Nat Commun. 2024 Feb 29;15(1):1888. doi: 10.1038/s41467-024-46129-7.
Stacking order plays a crucial role in determining the crystal symmetry and has significant impacts on electronic, optical, magnetic, and topological properties. Electron-phonon coupling, which is central to a wide range of intriguing quantum phenomena, is expected to be intricately connected with stacking order. Understanding the stacking order-dependent electron-phonon coupling is essential for understanding peculiar physical phenomena associated with electron-phonon coupling, such as superconductivity and charge density waves. In this study, we investigate the effect of stacking order on electron-infrared phonon coupling in graphene trilayers. By using gate-tunable Raman spectroscopy and excitation frequency-dependent near-field infrared nanoscopy, we show that rhombohedral ABC-stacked trilayer graphene has a significant electron-infrared phonon coupling strength. Our findings provide novel insights into the superconductivity and other fundamental physical properties of rhombohedral ABC-stacked trilayer graphene, and can enable nondestructive and high-throughput imaging of trilayer graphene stacking order using Raman scattering.
堆叠顺序在确定晶体对称性方面起着至关重要的作用，并且对电子、光学、磁性和拓扑性质有重大影响。电子 - 声子耦合是众多有趣量子现象的核心，预计它与堆叠顺序有着复杂的联系。理解依赖于堆叠顺序的电子 - 声子耦合对于理解与电子 - 声子耦合相关的奇特物理现象（如超导性和电荷密度波）至关重要。在本研究中，我们研究了堆叠顺序对石墨烯三层膜中电子 - 红外声子耦合的影响。通过使用栅极可调拉曼光谱和与激发频率相关的近场红外纳米显微镜，我们表明菱方ABC堆叠的三层石墨烯具有显著的电子 - 红外声子耦合强度。我们的发现为菱方ABC堆叠的三层石墨烯的超导性和其他基本物理性质提供了新的见解，并且能够利用拉曼散射对三层石墨烯的堆叠顺序进行无损且高通量成像。
