Interlayer interaction in 2H-MoTe2/hBN heterostructures
Interlayer interaction in 2H-MoTe2/hBN heterostructures
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DOI：
10.1088/2053-1583/ac1254
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发表时间：
2021
期刊：
影响因子：
5.5
通讯作者：
Manh Hong Nguyen;S. Lim;T. Taniguchi;K. Wantanabe;H. Cheong
中科院分区：
文献类型：
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作者：
Manh Hong Nguyen;S. Lim;T. Taniguchi;K. Wantanabe;H. Cheong
用低频拉曼光谱研究了2 H-MoTe 2/hBN异质结构的层间振动模式。在1-4层MoTe 2薄膜中观察到一系列低频拉曼模：MoTe 2薄膜的剪切模在异质结构中保持不变，但呼吸模在异质结构中有显著的变化。呼吸模式的数量和频率不依赖于两种材料之间的扭转角，但强烈地随MoTe 2和hBN层的层厚度而变化。呼吸模式，观察到共振（1.96 eV）和非共振（2.41 eV）激发。使用线性链模型分析了呼吸模式频率，2 H-MoTe 2和hBN之间的界面力常数估计为3.77 × 1019 N m−3。
Interlayer vibrational modes in 2H-MoTe2/hBN heterostructures were investigated by low-frequency Raman spectroscopy. A series of low-frequency Raman modes are observed for MoTe2 thicknesses of 1–4 layers: the shear modes of MoTe2 persist in the heterostructure with no shift in the frequency, but the breathing modes show dramatic changes in the heterostructures. The number and the frequencies of the breathing modes do not depend on the twist angle between the two materials but strongly vary with the layer thicknesses of both MoTe2 and hBN layers. The breathing modes were observed for both resonant (1.96 eV) and non-resonant (2.41 eV) excitations. The breathing mode frequencies were analyzed by using the linear chain model, and the interfacial force constant between 2 H-MoTe2 and hBN is estimated to be 3.77 × 1019 N m−3.