计算物理 ›› 2005, Vol. 22 ›› Issue (2): 149-154.

• 研究论文 • 上一篇    下一篇

环形碳纳米管-量子点耦合系统的介观输运

赵宏康1,2, 王清1   

  1. 1. 北京理工大学物理系, 北京 100081;
    2. 香港大学物理系, 香港
  • 收稿日期:2004-01-15 修回日期:2004-06-22 出版日期:2005-03-25 发布日期:2005-03-25
  • 作者简介:赵宏康(1959-),male, Dali, Yunnan, Prof., mesoscopic physics, nano-electronics.
  • 基金资助:
    Supported by a RGC grant from the SAR Government of Hong Kong under Grant No. HKU 7032/03P,and by the National Natural Science Foundation of China under the Grant No. 10375007.

Mesoscopic Transport Through a Toroidal Carbon Nanotube and a Quantum Dot Coupled System

ZHAO Hong-kang1,2, WANG Qing1   

  1. 1. Department of Physics, Beijing Institute of Technology, Beijing 100081, China;
    2. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China
  • Received:2004-01-15 Revised:2004-06-22 Online:2005-03-25 Published:2005-03-25
  • Supported by:
    Supported by a RGC grant from the SAR Government of Hong Kong under Grant No. HKU 7032/03P,and by the National Natural Science Foundation of China under the Grant No. 10375007

摘要: 应用非平衡格林函数方法研究通过环形碳纳米管-量子点耦合系统的介观输运.相干隧穿与环形碳纳米管和量子点各自的能级结构有强烈的依赖关系,阿哈郎诺夫-玻姆效应使能级周期性变化,隧穿电流则随磁通量作周期性振荡.环形碳纳米管的具体纳米结构显示出金属-半导体相变特性,这种行为也在输出电流中体现出来.子系统量子能级的匹配与失配关系在介观输运过程中起重要作用.

关键词: 介观输运, 碳纳米管, 量子点

Abstract: The mesoscopic transport through a quantum dot and a toroidal carbon nanotube (TCN) coupled system is investigated with the nonequilibrium Green's function technique.The coherent tunneling is strongly related to the energy structures of the TCN and the quantum dot.The Aharonov-Bohm effect causes energy levels of the TCN to change periodically,and the tunneling current oscillates with the magnetic flux.The detailed nanostructure of TCN exhibits metal-semiconductor transition,and this behavior is reflected in the output current.The matching-mismatching of quantum levels of the sub-systems plays important role in the mesoscopic transport.

Key words: mesoscopic transport, carbon nanotube, quantum dot

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