Excitons in carbon nanotubes with broken time-reversal symmetry

被引：96

作者：

Zaric, S

Ostojic, GN

Shaver, J

Kono, J ^{[1
]}

Portugall, O

Frings, PH

Rikken, GLJA

Furis, M

Crooker, SA

Wei, X

Moore, VC

Hauge, RH

Smalley, RE

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Lab Natl Champs Magnet Pulses, F-31432 Toulouse 04, France

[3] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[4] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[5] Rice Univ, Dept Chem, Houston, TX 77005 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.96.016406

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields (> 55 T). We show that the peak separation is determined by the Aharonov-Bohm phase due to the tube-threading magnetic flux, which breaks the time-reversal symmetry and lifts the valley degeneracy. This field-induced symmetry breaking thus overcomes the Coulomb-induced intervalley mixing which is predicted to make the lowest exciton state optically inactive (or dark).

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页数：4

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