Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene.
Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene.
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DOI：
10.1021/acsnano.3c00022
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发表时间：
2023-06
期刊：
影响因子：
17.1
通讯作者：
He Hao;Miao‐Ling Lin;Bo Xu;Heng-Zhou Wu;Yuechen Wang;H. Peng;Pingheng Tan;L. Tong;Jin Zhang-Jin
中科院分区：
文献类型：
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作者：
He Hao;Miao‐Ling Lin;Bo Xu;Heng-Zhou Wu;Yuechen Wang;H. Peng;Pingheng Tan;L. Tong;Jin Zhang-Jin
二维货车德瓦耳斯异质结构（vdWHs）层间耦合的表征对于理解其量子行为和结构功能是必不可少的。层间剪切声子和层呼吸声子携带着丰富的层间相互作用信息，但由于电子-声子耦合（EPC）较弱，通常很难通过标准拉曼光谱检测到。在这里，我们报告了一个通用的策略，以提高LB模式的vdWHs的基础上扭曲双层石墨烯（tBLG）。在tBLG/hBN和tBLG/MoS 2 vdWHs中，tBLG中的共振激发电子可以强烈地耦合到vdWHs中的整个层上延伸的LB声子，其共振条件可以通过tBLG的扭转角来调谐。在包含具有多个扭曲界面的扭曲石墨烯层的vdWH中，来自整个异质结构层的集体LB振动的LB声子的EPC可以通过根据每个扭曲界面的可编程货车霍韦奇点的共振激发来调谐。由于tBLG增强LB声子的普适性和可调谐性，使其成为研究相关vdWHs中EPC和层间相互作用的一种很有前途的方法。
The characterization of interlayer coupling in two-dimensional van der Waals heterostructures (vdWHs) is essential to understand their quantum behaviors and structural functionalities. Interlayer shear and layer-breathing (LB) phonons carry rich information on interlayer interaction, but they are usually too weak to be detected via standard Raman spectroscopy due to the weak electron-phonon coupling (EPC). Here, we report a universal strategy to enhance LB modes of vdWHs based on twisted bilayer graphene (tBLG). In both tBLG/hBN and tBLG/MoS2 vdWHs, the resonantly excited electrons in tBLG can strongly couple to LB phonons extended over the entire layers in the vdWHs, whose resonance condition is tunable by the twist angle of tBLG. In vdWHs containing twisted graphene layers with multiple twisted interfaces, the EPC of LB phonons coming from the collective LB vibrations of entire heterostructure layers can be tuned by resonant excitation of programmable van Hove singularities according to each twisted interface. The universality and tunability of enhanced LB phonons by tBLG make it a promising method to investigate EPC and interlayer interaction in related vdWHs.