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A Theoretical Analysis of Torque and Superlubric Motion in Bilayer Graphene Disks

ISSN号：1005-2046
期刊名称：《有色金属材料与工程》
时间：0
分类：TB34[一般工业技术—材料科学与工程]
作者机构：[1]Institute for Advanced Study, Nanchang University,Nanchang 330031, Jiangxi, China, [2]School of Science, Nanchang Institute of Technology,Nanchang 330099, Jiangxi, China
相关基金：Supported by the National Basic Research Program of China （973 Program）（2013CB934200）, the Key Program of the National Natural Science Foundation of China （10832005） and the National Natural Science Foundation of China （ 11264030）

关键词： graphene, 磁盘, 不相称, SUPERLUBRICITY, 转矩, TB, 34, graphene disk, incommensurate, superlubricity, torque

中文摘要：

为了识别在转矩和 superlubric 之间的关系，打手势，我们调查与数字计算方法滑动二个 graphene 磁盘的行为的夹层。在顶和底部 graphene 磁盘之间的势能，侧面的力量和转矩，与不合身的衣服角度，翻译排水量和夹层距离被联系，被分析。结果证明最高的磁盘的旋转为同量的状态是微弱的，但是由于显著地波动的侧面的力量认识到 superlubricity 是困难的。为不相称的状态，薄片展出仅仅为部分滑动方向来临到零的消失的转矩。在顶和底部磁盘之间的 superlubricity 将沿着另外的滑动方向由于导致转矩的重取向被消除。是否为同量或不相称的接触，侧面的力量的振幅(516 pN 和 13 pN，分别地) 在对试验性的观察的质的同意(典型地 250 pN 和 50 pN，分别地) 。它证明夹层转矩对有不相称的接触的最高的磁盘尺寸感觉迟钝。结果建议 graphene 磁盘的 superlubric 运动能被调整转矩控制。

英文摘要：

To identify the relation between torque and superlubric motion, we investigate the interlayer sliding behavior of two graphene disks with numerical computation methods. The potential energy, lateral force and torque between the top and bottom graphene disks, which are associated with misfit angle, translational displacement and interlayer distance, are analyzed. The results show that the rotation of the top disk is feeble for commensurate state, but it is difficult to realize superlubricity due to the lateral force fluctuating remarkably. For incommensurate state, the flake exhibits vanishing torque approaching to zero only for partial sliding directions. The superlubricity between the top and bottom disks will be eliminated due to torque-induced reorientation along other sliding directions. Whether for commensurate or incommensurate contact, the amplitudes of the lateral force （516 pN and 13 pN, respectively） are in qualitative agreement with experimental observation （typically 250 pN and 50 pN, respectively）. It shows that the interlayer torque is insensitive to the top disk size with incommensurate contact. The results suggest that the superlubric motion of graphene disk can be controlled by adjusting the torque.

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