Dependence of exciton transition energy of single-walled carbon nanotubes on surrounding dielectric materials
Dependence of exciton transition energy of single-walled carbon nanotubes on surrounding dielectric materials
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DOI：
10.1016/j.cplett.2007.06.018
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发表时间：
2007-07-17
影响因子：
2.8
通讯作者：
Maruyama, S.
中科院分区：
文献类型：
--
作者：
Miyauchi, Y.;Saito, R.;Maruyama, S.
通过计算单壁碳纳米管的激子跃迁能，从理论上研究了环境对单壁碳纳米管光学跃迁能的影响。激子计算中所用的静态介电常数可以表示为周围材料介电常数和单壁碳纳米管介电常数的函数，其中单壁碳纳米管的静态介电常数和动态介电常数分别代表核心电子和价pi电子的屏蔽效应。计算结果重现了不同周围材料和不同直径单壁碳纳米管实验跃迁能的环境效应。(C)2007 Elsevier B.V.保留所有权利。
We theoretically investigate the environmental effect for optical transition energies of single-walled carbon nanotubes (SWNTs), by calculating the exciton transition energies of SWNTs. The static dielectric constants used in the exciton calculation can be expressed as a function of the dielectric constants of the surrounding material and that of the SWNT, in which the static and dynamic dielectric constants of the SWNT represent the screening effect of core electrons and the valence pi electrons, respectively. The calculated results reproduce the environmental effect of the experimental transition energies for various surrounding materials and for various diameters of SWNTs. (c) 2007 Elsevier B.V. All rights reserved.