摘要
利用导出的任意手性碳纳米环 (TCNTs)的电子状态—能量关系式 ,对磁场中任意手性TCNTs所具有的类似超导环的性质及持续电流的手性效应进行理论探讨。在T =0K时 ,金属型和半导体型TCNTs象介观一维正常金属环一样具有类似超导环的性质、即持续电流以磁通量子Φ0 为周期随Φ线性变化 ,且对手性角θ、环半径R极为敏感。手性TCNTs类似超导环的性质比高对称TCNTs明显得多 ,但随R增大而减弱 ,且减弱的快慢也与手性角θ有关。
The superconducting ring-like property and the chiral effects of persistent currents in toroidal carbon nanotubes (TCNTs) are studied in this paper by using the electronic state energy formula of chiral TCNTs derived from the energy dispersion relation of the graphene sheet. When T =0 K, the persistent current of metallic and semiconductortype TCNTs is a linealy periodical function of Φ , with a period Φ 0 , but it is very sensitive to chiral angle θ and toroidal radius R . The persistent currents in chiral TCNTs are much stronger than in the achiral TCNTs. It also have been discovered that persistent currents decrease when toroidal radius R increase or temperature rise,and the decreasing rate depends the chiral angle θ of TCNTs.
基金
国家自然科学基金 (批准号 :59972 0 31)&&
