发表机构
Technion - Israel Institute of Technology; University of Science and Technology of China; National Institute for Materials Science; Tel Aviv University（以色列理工学院; 中国科学技术大学; 物质材料研究机构; 特拉维夫大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出利用外加扭矩可切换六方氮化硼的两种稳定堆叠构型，揭示其扭转特性及与电极化的关联，为可重构纳米机电设备提供新路径。
AI 中文摘要
层状材料的扭转电子学因在量子电子学和材料工程中的深远意义已成为一个高度活跃的领域，但层间堆叠的可控操纵仍是重大实验挑战。本文表明，六方氮化硼层间的均匀接触可通过外加扭矩在两种不同的稳定堆叠构型之间实现可重复切换。结合实验与计算建模，我们确定这些稳定态的堆叠序为 commensurate AA 和 AB 模式。这两种态与不同的旋转扭矩最大值相关，呈现出 0.7 的不对称比，且随扭转角表现出不同的动力学特性。此外，峰值扭矩值与接触面积呈线性比例关系，凸显边缘弹性在扭转过程中的主导作用。鉴于 AA 和 AB 堆叠模式对应不同的面外电极化态，我们的发现为可重构纳米级和微机电设备提供了一条途径。
英文摘要
Twistronics of layered materials has emerged as a highly active field due to its profound implications for quantum electronics and materials engineering. However, the controllable manipulation of interlayer stacking remains a significant experimental challenge. Here, the homogeneous contact between hexagonal boron nitride layers is shown to be reproducibly switched between two distinct stable stacking configurations via an externally applied torque. Combining experiments and computational modelling, we identify the stacking order of these stable states as the commensurate AA and AB modes. These two states are associated with different rotational torque maxima, exhibiting an asymmetry ratio of 0.7, and distinct dynamics as a function of the twist angle. Moreover, the peak torque values scale linearly with contact area, highlighting the dominant role of edge elasticity in the twisting process. Given that the AA and AB stacking modes correspond to different out-of-plane electric polarization states, our findings offer a pathway for reconfigurable nano- and micro-electromechanical devices.
