扶手椅型石墨烯介观环中的持续电流  

Persistent currents in mesoscopic graphene rings with armchair edges

作　　者：代楠[1] 邓文基[1] 

机构地区：[1]华南理工大学物理系,广州510641

出　　处：《物理学报》2015年第1期297-303,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11004063);中央高校基本科研业务费专项基金(批准号:2014ZG0044)资助的课题~~

摘　　要：在紧束缚近似下,解析求解了扶手椅型边界石墨烯介观环的能量本征值问题,计算和讨论了不同大小尺寸的介观环中持续电流随Aharonov-Bohm(A-B)磁通的变化,并证明了能级和持续电流关于磁通变化的周期性和特殊对称性.研究表明,持续电流显著地依赖于介观环的几何结构;零能量附近的能级可以承载较大的持续电流,而远离零能量的其他能级对持续电流的贡献很小.Based on the tight-binding model, the energy spectrum and persistent currents of mesoscopic graphene rings with armchair edges are studied analytically and numerically. Characters of the persistent currents changing with Aharonov- Bohm （A-B） magnetic flux in rings in different geometry are investigated in datail. The periodicity and special symmetry of energy spectrum and persistent currents changing with the magnetic flux are revealed. It is demonstrated that the persistent currents are determined by the geometric structures of the rings; the quantum states with small eigen-energies may carry much larger currents than those quantum states with eigen-energies far away from zero.

关 键 词：石墨烯介观环 持续电流 推广的Bloch定理 

分 类 号：TQ127.11[化学工程—无机化工]