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系统地计算了各种手性碳纳米管最低导带的电子速度和有效质量的变化规律,在此基础上推断手性碳纳米管低偏压下的输运特征,计算表明:在低偏压电子输运时,同一系列(手性角相同)的各种手性金属碳纳米管的输运性质相同,与管径无关,但不同系列的手性金属碳纳米管的输运性质有明显区别;而同一系列的各种手性半导体型碳纳米管的输运性质有一定差异,但不同系列的手性半导体型碳纳米管的输运性质有着显著差异.这一结果说明:碳纳米管在低偏压下的输运特征与系列有着密切的关系,手性角是决定各种碳纳米管在低偏压下具有不同输运性质的最关键的几何参量.
The variation of electron velocity and effective mass of the lowest conduction band of various chiral carbon nanotubes was systematically calculated. Based on this, the transport characteristics of chiral nanotubes under low bias were inferred. The calculation shows that at low bias In electron transport, the transport properties of all kinds of chiral metallic carbon nanotubes in the same series (same chiral angle) are the same but have no relation with the diameter, but the transport properties of different series of chiral metallic carbon nanotubes are obviously different ; While the transport properties of various chiral semiconducting carbon nanotubes in the same series are different, but the transport properties of different series of chiral semiconducting carbon nanotubes are significantly different. This result shows that: The transport characteristics under low bias are closely related to the series. Chiral angle is the most critical geometric parameter that determines the various transport properties of carbon nanotubes under low bias.