Radiative lifetime of excitons in carbon nanotubes

被引：242

作者：

Perebeinos, V ^{[1
]}

Tersoff, J ^{[1
]}

Avouris, P ^{[1
]}

机构：

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

来源：

NANO LETTERS | 2005年 / 5卷 / 12期

关键词：

D O I：

10.1021/nl051828s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We calculate the radiative lifetime and energy bandstructure of excitons in semiconducting carbon nanotubes within a tight-binding approach including the electron-hole correlations via the Bethe-Salpeter equation. In the limit of rapid interband thermalization, the radiative decay rate is maximized at intermediate temperatures and decreases at low temperature because the lowest-energy excitons are optically forbidden. The intrinsic phonons cannot scatter excitons between optically active and forbidden bands, so sample-dependent extrinsic effects that break the symmetries can play a central role. We calculate the diameter-dependent energy splittings between singlet and triplet excitons of different symmetries and the resulting dependence of radiative lifetime on temperature and tube diameter.

引用

页码：2495 / 2499

页数：5

共 39 条

[1] Excitons in carbon nanotubes [J].

Ando, T .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1997, 66 (04) :1066-1073

[2] Structure-assigned optical spectra of single-walled carbon nanotubes [J].

Bachilo, SM ;

Strano, MS ;

Kittrell, C ;

Hauge, RH ;

Smalley, RE ;

Weisman, RB .

SCIENCE, 2002, 298 (5602) :2361-2366

[3] Excitons in carbon nanotubes:: An ab initio symmetry-based approach -: art. no. 196401 [J].

Chang, E ;

Bussi, G ;

Ruini, A ;

Molinari, E .

PHYSICAL REVIEW LETTERS, 2004, 92 (19) :196401-1

[4] LONG INTRINSIC RADIATIVE LIFETIMES OF EXCITONS IN QUANTUM WIRES [J].

CITRIN, DS .

PHYSICAL REVIEW LETTERS, 1992, 69 (23) :3393-3396

[5] Structural dependence of excitonic optical transitions and band-gap energies in carbon nanotubes [J].

Dukovic, G ;

Wang, F ;

Song, DH ;

Sfeir, MY ;

Heinz, TF ;

Brus, LE .

NANO LETTERS, 2005, 5 (11) :2314-2318

[6]

EPDERSEN TG, 2003, PHYS REV B, V67, P3401

[7] LINEWIDTH DEPENDENCE OF RADIATIVE EXCITON LIFETIMES IN QUANTUM-WELLS [J].

FELDMANN, J ;

PETER, G ;

GOBEL, EO ;

DAWSON, P ;

MOORE, K ;

FOXON, C ;

ELLIOTT, RJ .

PHYSICAL REVIEW LETTERS, 1987, 59 (20) :2337-2340

[8] Marginal-Fermi-liquid behavior from two-dimensional Coulomb interaction [J].

González, J ;

Guinea, F ;

Vozmediano, MAH .

PHYSICAL REVIEW B, 1999, 59 (04) :R2474-R2477

[9] Exponential decay lifetimes of excitons in individual single-walled carbon nanotubes [J].

Hagen, A ;

Steiner, M ;

Raschke, MB ;

Lienau, C ;

Hertel, T ;

Qian, HH ;

Meixner, AJ ;

Hartschuh, A .

PHYSICAL REVIEW LETTERS, 2005, 95 (19)

[10] Electronic structure and dynamics of optically excited single-wall carbon nanotubes [J].

Hagen, A ;

Moos, G ;

Talalaev, V ;

Hertel, T .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2004, 78 (08) :1137-1145

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