异质结构中单层 WSe2 对双层 MoS2 层间相互作用的改变

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

2D Materials Pub Date : 2024-01-03 DOI:10.1088/2053-1583/ad1a6f

Siwon Oh, Han-gyu Kim, Jungcheol Kim, Huiseok Jeong, H. Choi, Hyeonsik Cheong

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引用次数: 0

摘要

研究了双层-MoS2/单层-WSe2 异质结构中的低频层间振动模式，以研究摩尔周期性对层间相互作用的改变。双层 MoS2 内的层间相互作用和两种材料之间的界面相互作用相互作用导致声子光谱中出现了丰富的特征。在小扭转角（<10°）的样品中观察到几种剪切和呼吸模式，而在大扭转角的样品中只观察到一种剪切和两种呼吸模式。对于较大的扭转角，两种材料之间的界面相互作用相当于 MoS2 层间固有层间相互作用的 75%。声子谱随着扭转角的增大而非单调地演化，这可以通过原子计算来解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Modification of interlayer interaction in bilayer MoS2 due to monolayer WSe2 in heterostructures

The low-frequency interlayer vibration modes in bilayer-MoS2/monolayer-WSe2 heterostructures were investigated to study the modification of interlayer interactions due to the moiré periodicity. The interplay of the interlayer interaction within bilayer MoS2 and the interfacial interaction between the two materials results in rich features in the phonon spectra. Several shear and breathing modes are observed for samples with small twist angles (<10°), whereas only one shear and two breathing modes are observed for larger twist angles. For larger twist angles, the interfacial interaction between the two materials amounts to ∼75% of the intrinsic interlayer interaction between the MoS2 layers. The phonon spectrum evolves non-monotonically as the twist angle increases, which is explained with the help of atomistic calculations.

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来源期刊

2D Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

10.70

自引率

5.50%

发文量

138

审稿时长

1.5 months

期刊介绍： 2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.