Inversion Symmetry and Exotic Interlayer Exciton Behavior in Twisted Trilayer MoS2 Produced by Vapor Deposition,ACS Applied Materials & Interfaces

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Inversion Symmetry and Exotic Interlayer Exciton Behavior in Twisted Trilayer MoS2 Produced by Vapor Deposition
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-11 , DOI: 10.1021/acsami.2c18687
Weiyang Liu ₁ , Siwei Luo ₁ , Xiang Qi ₁ , Gencai Guo ₁ , Jun Li ₁ , Han Tang ₁ , Xu Li ₁ , Xixi Huang ₁ , Zhiyuan Tang ₁ , Jianxin Zhong ₁

Affiliation

Two-dimensional materials (2DMs) that are stacked vertically with a certain twist angle provide new degrees of freedom for designing novel physical properties. Twist-related properties of homogeneous bilayer and heterogeneous bilayer 2DMs, such as excitons and phonons, have been described in many pioneering works. However, twist-related properties of homogeneous trilayer 2DMs have been rarely reported. In this work, trilayer MoS₂ with the twisted angle of 12° by optimized vapor deposition rather than the conventional mechanical stacking method was successfully fabricated. The inversion symmetry of trilayer MoS₂ is changed by twist. Phonons and excitons produced by twist have an enormous influence on the interlayer interaction of trilayer MoS₂, making trilayer MoS₂ appear to have exotic optical properties. Compared with monolayer MoS₂, the phonon vibration and photoluminescence intensity of trilayer MoS₂ with one-interlayer-twisted are significantly improved, and the second harmonic generation response in the non-twist region of trilayer MoS₂ is ∼3 times that of monolayer MoS₂. In addition, interlayer coupling, inversion symmetry, and exciton behavior of the twist region show regional differences. This work provides a new way for designing twist and exploring the influence of twist on the structures of 2DMs with few layers.

中文翻译：

气相沉积扭曲三层二硫化钼的反转对称性和奇异层间激子行为

以一定扭转角垂直堆叠的二维材料 (2DM) 为设计新颖的物理特性提供了新的自由度。同质双层和异质双层 2DM（例如激子和声子）的扭曲相关特性已在许多开创性著作中进行了描述。然而，很少报道均匀三层 2DM 的扭曲相关特性。在这项工作中，通过优化的气相沉积而不是传统的机械堆叠方法成功地制造了扭曲角为 12° 的三层 MoS _{2 。}三层MoS ₂的反转对称性因扭曲而改变。扭曲产生的声子和激子对三层MoS _{2的层间相互作用有巨大影响}，使三层 MoS ₂看起来具有奇异的光学特性。与单层MoS _{2相比，层间扭曲的三层MoS}₂的声子振动和光致发光强度显着提高，三层MoS ₂非扭曲区域的二次谐波产生响应是单层MoS ~ 3倍₂ . 此外，扭曲区的层间耦合、反转对称性和激子行为也表现出区域差异。这项工作为设计扭曲和探索扭曲对少层 2DM 结构的影响提供了一种新方法。

更新日期：2023-01-11

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