Jia Pengfei, Chen Wenjing, Qiao Jiabin, Zhang Miao, Zheng Xiaohu, Xue Zhongying, Liang Rongda, Tian Chuanshan, He Lin, Di Zengfeng, Wang Xi
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China.
Nat Commun. 2019 Jul 16;10(1):3127. doi: 10.1038/s41467-019-11038-7.
Graphene nanobubbles (GNBs) have attracted much attention due to the ability to generate large pseudo-magnetic fields unattainable by ordinary laboratory magnets. However, GNBs are always randomly produced by the reported protocols, therefore, their size and location are difficult to manipulate, which restricts their potential applications. Here, using the functional atomic force microscopy (AFM), we demonstrate the ability to form programmable GNBs. The precision of AFM facilitates the location definition of GNBs, and their size and shape are tuned by the stimulus bias of AFM tip. With tuning the tip voltage, the bubble contour can gradually transit from parabolic to Gaussian profile. Moreover, the unique three-fold symmetric pseudo-magnetic field pattern with monotonous regularity, which is only theoretically predicted previously, is directly observed in the GNB with an approximately parabolic profile. Our study may provide an opportunity to study high magnetic field regimes with the designed periodicity in two dimensional materials.
石墨烯纳米气泡（GNBs）因其能够产生普通实验室磁铁无法实现的强伪磁场而备受关注。然而，根据已报道的方法，GNBs总是随机产生的，因此，它们的大小和位置难以控制，这限制了它们的潜在应用。在此，我们利用功能原子力显微镜（AFM）展示了形成可编程GNBs的能力。AFM的精度有助于确定GNBs的位置，并且它们的大小和形状可通过AFM针尖的激励偏压进行调整。通过调节针尖电压，气泡轮廓可以逐渐从抛物线形转变为高斯形。此外，在具有近似抛物线轮廓的GNB中直接观察到了独特的三重对称伪磁场模式，且具有单调规律性，这一模式此前仅在理论上有过预测。我们的研究可能为在二维材料中研究具有设计周期性的高磁场区域提供契机。
