Guan Zhao, Zheng Yun-Zhe, Tong Wen-Yi, Zhong Ni, Cheng Yan, Xiang Ping-Hua, Huang Rong, Chen Bin-Bin, Wei Zhong-Ming, Chu Jun-Hao, Duan Chun-Gang
Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, China.
Shanghai Center of Brain-inspired Intelligent Materials and Devices, East China Normal University, Shanghai, 200241, China.
Adv Mater. 2024 Jul;36(30):e2403929. doi: 10.1002/adma.202403929. Epub 2024 May 21.
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.
二维极化材料因其独特的电子构型和输运特性，已成为满足器件小型化需求的有前景的候选材料。尽管近年来对现有的固有和滑动机制的研究越来越多，但利用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型的二维雅努斯态。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，本工作在GeSe中实现了具有扭曲较小翘曲的力触发面外和面内偶极子。去除外部机械扰动后，雅努斯态得以保留，并且可以通过调制滑动方向来切换。这项工作提供了一种通用的方法来打破二维系统中的空间反演对称性，以在原子尺度上触发极化，这可能为配置新型二维极化材料开辟新的思路。
