外加磁场在弯曲石墨烯纳米带悬臂中的电流分布

Kazunori Maebuchi, Norio Inui
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引用次数: 0

摘要

摘要石墨烯具有抗磁性,其来源是外加磁场在其表面产生的轨道电流。石墨烯悬臂梁在磁场作用下的磁响应主要由抗磁性电流和自旋顺磁性决定,自旋顺磁性抑制了抗磁性。我们利用紧密结合模型阐明了石墨烯悬臂梁的大弯曲引起的电流分布的变化。当石墨烯悬臂梁的位置从垂直于磁场转变为平行于磁场时,电流几乎消失,当石墨烯悬臂梁对折时,电流反过来。此外,利用分子动力学模拟计算了石墨烯悬臂梁振动磁能的随时间变化。石墨烯悬臂梁的磁化强度对其相对于磁场的位置有很强的依赖性,可以用于驱动和控制悬臂梁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electric current distribution induced by applied magnetic field in a bent graphene nanoribbon cantilever
Abstract Graphene exhibits diamagnetism, and its origin is the orbital electric currents induced on the surface by an applied magnetic field. The magnetic response of a graphene cantilever in the presence of a magnetic field is mainly determined by the diamagnetic electric current, and spin paramagnetism, which suppresses the diamagnetism. We elucidate the change in the electric current distribution caused by the large bending of the graphene cantilever using the tight-binding model. The electric current almost disappears when the position of the graphene cantilever transitions from perpendicular to parallel to the magnetic field and reverses when the graphene cantilever is folded in half. Furthermore, the temporal change in the magnetic energy of the vibrating graphene cantilever is calculated using the molecular dynamics simulation. The strong dependence of the magnetization of a graphene cantilever on its position relative to the magnetic field can be utilized for actuating and controlling the cantilever.
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