Time-dependent electron transport in carbon nanotubes with impurities

被引：2
|
作者：
Pan, H [1 ]
Lin, TH
Yu, DP
机构：
[1] Peking Univ, Dept Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
[2] Beijing Univ Aeronaut & Astronaut, Dept Phys, Beijing 100083, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2005年 / 369卷 / 1-4期
基金：
中国国家自然科学基金;
关键词：
nanotube; impurity; transport;
D O I：
10.1016/j.physb.2005.07.025
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Impurity effects on time-dependent electron transport through armchair carbon nanotubes connected with normal-metal leads are investigated theoretically. The system shows on-resonance and off-resonance behaviors according to different nanotube lengths. The impurity suppresses the current for the on-resonance case, while it enhances the current for the off-resonance case. Additional resonant peaks caused by photon-assisted tunneling are found when microwave fields are applied. The effects of the impurity strength are also studied, and one new peak induced by photon-assisted tunneling is found. The dependence of the current on the microwave frequency clearly shows the electron-hole symmetry broken. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：33 / 38
页数：6
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