Modulation of alternating electric field inside photoexcited carbon nanotubes

被引：18

作者：

Zhang, Hong ^{[1
]}

Miyamoto, Yoshiyuki ^{[2
]}

机构：

[1] Sichuan Univ, Sch Phys Sci & Technol, Chengdu 610065, Peoples R China

[2] NEC Corp Ltd, Nanoelect Res Labs, Tsukuba, Ibaraki 3058501, Japan

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 05期

基金：

中国国家自然科学基金;

关键词：

ab initio calculations; carbon nanotubes; density functional theory; elemental semiconductors; photoexcitation; wave functions; EXPONENTIAL OPERATORS; OPTICAL-PROPERTIES; MODEL; MICROTUBULES; SYSTEMS; GAS;

D O I：

10.1063/1.3196317

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Modulation of an alternating electric field (E-field) inside semiconducting carbon nanotubes (CNTs) has been studied with polarization perpendicular to the tube axis. The real-time dynamics of the electron wave functions and atoms in the CNTs was investigated by applying first-principles time-dependent density functional theory. The E-field inside the CNTs was not screened completely and was actually enhanced depending on the frequency. The enhancement was due to the increasing amplitude of the oscillating electron cloud with the resonant frequency. This finding provides a clear insight into the optical response of CNTs and also of molecules encapsulated in CNTs.

引用

页数：3

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