摘要
基于石墨平面π电子的紧束缚模型 ,导出了手性 (chiral)环状碳纳米管 (TCNTs)在磁场中的电子结构 ,从而对TCNTs量子特性和磁化规律进行了较深入研究 .第Ⅰ ,Ⅱ类TCNTs在磁场中存在金属—半导体的连续转变 .计算分析表明 :在T =0K时 ,第Ⅰ ,Ⅱ类TCNTs的磁化强度随磁通量Φ呈线性周期性变化 (以磁通量子Φ0 =h e为周期 ) ,并且磁化强度对手性角θ、管口半径r,以及温度T极为敏感 ,但与环半径R无关 .手性TCNTs的磁化强度比椅形或锯齿形TCNTs的磁化强度强很多 ;而第Ⅲ类TCNTs的磁化强度极弱 ,且无规律 .
Based on the tight-binding model of pi electrons for a graphite sheet, the electronic structure of the chiral toroidal carbon nanotubes (TCNTs) has been derived. The quantum properties and magnetic pattern of TCNTs have been investigated in detail in this paper. A magnetic field can induce a metal-semiconductor transition for type I and II TCNTs. The computation and analysis also show: when T = OK, the magnetism of type I and 11 TCNTs are a linearly function of the magnetic flux Phi, with a period Phi (0), ( h/e), which is sensitive to chiral angle theta, toroidal width r and temperture T, independent of toroidal radius R. The magnetism of chiral TCNTs is much stronger than that of the armchair or zigzag TCNTs. The magnetism of type m TCNTs is very weak, without regularity.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期1150-1156,共7页
Acta Physica Sinica
基金
国家自然科学基金! (批准号 :5 9972 0 3 1)
湖南省自然科学基金! (批准号 :9811Y2 0 47)资助的课题&&
