环状碳纳米卷中的持续电流
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德宏师范高等专科学校

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O481.1

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Persistent currents in toroidal carbon nanoscrolls
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Dehong Teachers’ College

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    摘要:

    在环状碳纳米卷紧束缚模型的基础上,导出了相应的持续电流表达式,并系统地研究了环状碳纳米卷的几何结构、分离能级、温度及塞曼效应对持续电流的影响。结果表明,环状碳纳米卷内部的持续电流数量级仅为10-7 A,并且随着卷环周长的增大而逐渐减小。费米能级附近的能级几乎承载了所有持续电流,而远离的能级贡献非常小。随着温度的升高,持续电流急剧减小,卷环周长越大,持续电流消失的越快。对于较大的,考虑塞曼效应后,持续电流出现了新的越变,周期性结构遭到破坏。

    Abstract:

    Based on the toroidal carbon nanoscrolls tight-binding model, the expressions of persistent currents are derived, and the effects of geometric structure, separation energy level, temperature and Zeeman effect on persistent current are systematically studied. The results show that the persistent current in the toroidal carbon nanoscrolls is only 10-7 A, and as the circumference of the coil increases, the persistent current will gradually decrease. The states near the Fermi level carries almost all of the persistent current, while the far-off states contribute very little. As the temperature increases, the persistent current decreases sharply, and the larger the coil, the faster the persistent currents vanish. Considering the Zeeman effect, the persistent current appears new jump structures and the periodic structure is destroyed for larger Φ.

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历史
  • 收稿日期:2019-06-09
  • 最后修改日期:2019-07-13
  • 录用日期:2019-08-18
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