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在紧束缚理论的基础上推导出轴向磁场下碳纳米管的能带公式,研究外加磁场下碳纳米管场效应晶体管的电学特性.说明磁场可使碳管的导电性质在金属型和半导体型之间转变,转变的磁场周期为0.50.进一步应用场效应晶体管Natori理论模拟计算了外加磁场对碳纳米管场效应晶体管的电流-电压特性的影响,研究结果显示zigzag管和armchair管的电流随外电压和磁场都有振荡行为,而且两类管的振荡行为有明显差别.
Based on the tight binding theory, the energy band formula of carbon nanotubes in axial magnetic field is deduced, and the electrical characteristics of the field effect transistors in external magnetic field are studied. It is shown that the magnetic field can make the conductivity of carbon nanotubes in metal and semiconductor , The transition period is 0.50. The effect of external magnetic field on the current-voltage characteristics of the field effect transistor is further simulated by Natori theory. The results show that the current of the zigzag and armchair With the external voltage and magnetic field have oscillatory behavior, and two types of tube oscillation behavior are significantly different.