Strain-Controlled Dynamic Rotation of Twisted 2D Atomic Layers for Tunable Nanomechanical Systems,ACS Applied Nano Materials

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Strain-Controlled Dynamic Rotation of Twisted 2D Atomic Layers for Tunable Nanomechanical Systems
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-19 , DOI: 10.1021/acsanm.0c02140
Soumendu Bagchi ₁ , Harley T. Johnson ₂ , Huck Beng Chew ₁

Affiliation

Achieving fine control over the twist angles of stacked two-dimensional (2D) layers is critical for device fabrication. Here, we demonstrate that the interplay between lattice mismatch strain and flake size can control the potential energy barriers for dynamic untwisting of stacked 2D sheets at elevated temperatures. These energy barriers scale with flake size and originate from periodically fluctuating quantities of unstable AA versus stable Bernal stacking during untwisting. However, the lattice mismatch strains are more readily accommodated coherently across Bernal versus AA stacking, leading to significantly reduced energy differences between these stacking arrangements. These competing effects enable strain-controlled engineering of twisted 2D layers for tunable nanomechanical systems.

中文翻译：

可调纳米机械系统中扭曲二维原子层的应变控制动态旋转

实现对堆叠的二维（2D）层的扭曲角的精细控制对于器件制造至关重要。在这里，我们证明了晶格失配应变与薄片尺寸之间的相互作用可以控制在升高的温度下动态堆叠2D片材不加捻的势能垒。这些能量屏障随薄片尺寸而缩放，并且是由于在解捻期间，不稳定AA相对稳定的Bernal堆的周期性波动量引起的。但是，晶格失配应变更容易在Bernal与AA堆叠中相干适应，从而显着减小了这些堆叠排列之间的能量差。这些竞争效应使可变形纳米机械系统的2D扭曲层的应变控制工程得以实现。

更新日期：2020-11-25

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