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arXiv 2209.12460cond-mat.mes-hall
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范德华异质结中界面气泡动力学控制粘附力学

Dynamics of an interfacial bubble controls adhesion mechanics in a van der Waals heterostructure

L. D. Varma Sangani, Supriya Mandal, Sanat Ghosh, Kenji Watanabe, Takashi Taniguchi, Mandar M. Deshmukh

摘要:

二维范德华异质结构(vdWH)可以产生新的功能,关键取决于界面结构和无序。vdWH界面处的气泡可以改变界面结构。我们通过使用石墨烯-hBN vdWH作为NEMS设备的鼓面来探测石墨烯-hBN vdWH界面处的气泡的动力学,因为纳米机械设备是精致的传感器。对于鼓与不同的界面气泡,我们测量的谐振频率和空间模式的形状作为静电拉力的函数的演变。我们表明,滞后剥离层的vdWH是由大气泡的生长。由于应力集中,气泡生长发生,类似于断裂的开始。异质结构界面处的小气泡不会导致分层,因为它们小于临界断裂长度。我们提供洞察摩擦动力学和界面断裂的vdWH。

英文摘要:

2D van der Waals heterostructures (vdWH) can result in novel functionality that crucially depends on interfacial structure and disorder. Bubbles at the vdWH interface can modify the interfacial structure. We probe the dynamics of a bubble at the interface of a graphene-hBN vdWH by using it as the drumhead of a NEMS device because nanomechanical devices are exquisite sensors. For drums with different interfacial bubbles, we measure the evolution of the resonant frequency and spatial mode shape as a function of electrostatic pulling. We show that the hysteretic detachment of layers of vdWH is triggered by the growth of large bubbles. The bubble growth takes place due to the concentration of stress resembling the initiation of fracture. The small bubbles at the heterostructure interface do not result in delamination as they are smaller than a critical fracture length. We provide insight into frictional dynamics and interfacial fracture of vdWH.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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