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

页码：33 / 38

页数：6

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