Exciton ionization, Franz-Keldysh, and stark effects in carbon nanotubes

被引：112

作者：

Perebeinos, Vasili ^{[1
]}

Avouris, Phaedon ^{[1
]}

机构：

[1] IBM Corp, Thomas J Watson Res Ctr, Div Res, Yorktown Hts, NY 10598 USA

来源：

NANO LETTERS | 2007年 / 7卷 / 03期

关键词：

D O I：

10.1021/nl0625022

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We calculate the optical properties of carbon nanotubes in an external static electric field directed along the tube axis. We predict strong Franz-Keldysh oscillations in the first and second band-to-band absorption peaks, quadratic Stark effect of the first two excitons, and the field dependence of the bound exciton ionization rate for a wide range of tube chiralities. We find that the phonon-assisted mechanism dominates the dissociation rate in electro-optical devices due to the hot optical phonons. We predict a quadratic dependence of the Sommerfeld factor on the electric field and its increase up to 2000% at the critical field of the full exciton dissociation.

引用

页码：609 / 613

页数：5

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