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arXiv 1504.01540cond-mat.mes-hall
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塌陷碳纳米管的等效质量理论

Effective-mass theory of collapsed carbon nanotubes

Takeshi Nakanishi, Tsuneya Ando

摘要:

采用有效质量方法对部分扁平化碳纳米管的能带结构进行了理论研究。壁间相互作用的影响被证明是重要的,在非手性纳米管,如锯齿形和扶手椅,除了在非手性管附近的手性纳米管基本上可以忽略不计。事实上,壁间相互作用显着修改状态,这取决于在非手性管中的扁平区域中的相对位移,并且可以将半导体管转换为金属管,反之亦然。当手征角偏离Z字形管或扶手椅管时,它们迅速衰减,尽管扶手椅管附近的衰减较慢。

英文摘要:

Band structure is theoretically studied in partially flattened carbon nanotubes within an effective-mass scheme. Effects of inter-wall interactions are shown to be important in non-chiral nanotubes such as zigzag and armchair and can essentially be neglected in chiral nanotubes except in the close vicinity of non-chiral tubes. In fact, inter-wall interactions significantly modify states depending on relative displacement in the flattened region in non-chiral tubes and can convert semiconducting tubes into metallic and vice versa. They diminish rapidly when the chiral angle deviates from that of the zigzag or armchair tube, although the decay is slower in the vicinity of armchair tubes.

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