2D polarization materials have emerged as promising candidates for meeting the demands of device miniaturization, attributed to their unique electronic configurations and transport characteristics. Although the existing inherent and sliding mechanisms are increasingly investigated in recent years, strategies for inducing 2D polarization with innovative mechanisms remain rare. This study introduces a novel 2D Janus state by modulating the puckered structure. Combining scanning probe microscopy, transmission electron microscopy, and density functional theory calculations, this work realizes force-triggered out-of-plane and in-plane dipoles with distorted smaller warping in GeSe. The Janus state is preserved after removing the external mechanical perturbation, which could be switched by modulating the sliding direction. This work offers a versatile method to break the space inversion symmetry in a 2D system to trigger polarization in the atomic scale, which may open an innovative insight into configuring novel 2D polarization materials.

中文翻译：

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机械力作用下的二维 Janus 偏振


二维偏振材料因其独特的电子配置和传输特性而成为满足设备小型化需求的有前途的候选材料。尽管近年来人们越来越多地研究现有的固有机制和滑动机制，但通过创新机制诱导二维极化的策略仍然很少。本研究通过调制褶皱结构引入了一种新颖的二维 Janus 态。该工作结合扫描探针显微镜、透射电子显微镜和密度泛函理论计算，在GeSe中实现了力触发的面外和面内偶极子，且扭曲程度较小。在去除外部机械扰动后，Janus 状态得以保留，可以通过调节滑动方向来切换。这项工作提供了一种打破二维系统中的空间反转对称性以触发原子尺度偏振的通用方法，这可能为配置新型二维偏振材料开辟创新的见解。