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Magnetic response in finite carbon graphene sheets and nanotubes

机译:有限碳石墨烯片和纳米管中的磁响应

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摘要

The electronic and magnetic properties of graphene sheets with armchair and zig-zag edges are investigated using the Hueckel tight binding model in conjunction with the London approximation. It is observed that in the presence of a perpendicular external magnetic field, the nanographenes show a diamagnetic behavior exhibiting counter-clockwise ring currents. Topological defects such as vacancies, Stone-Wale transformations (bond rotations) and holes are introduced in the graphene sheets in order to enhance local paramagnetic ring currents. These ring currents produce a local magnetic moment perpendicular to the defective site. In addition, current flows in finite carbon nanotubes are investigated.
机译:使用Hueckel紧密结合模型和London逼近法研究了具有扶手椅状和Z字形边缘的石墨烯片的电子和磁性。观察到,在垂直的外部磁场的存在下,纳米石墨烯显示出反磁性行为,表现出逆时针的环电流。为了增强局部顺磁环电流,在石墨烯片材中引入了诸如缺陷,空位,石华变换(键旋转)和空穴之类的拓扑缺陷。这些环形电流产生垂直于缺陷部位的局部磁矩。另外,研究了在有限的碳纳米管中的电流流动。

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