Phonon-assisted exciton relaxation dynamics for a (6,5)-enriched DNA-wrapped single-walled carbon nanotube sample

被引：29

作者：

Chou, SG

DeCamp, MF

Jiang, J

Samsonidze, GG

Barros, EB

Plentz, F

Jorio, A

Zheng, M

Onoa, GB

Semke, ED

Tokmakoff, A

Saito, R

Dresselhaus, G

Dresselhaus, MS

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[3] CREST, JST, Sendai, Miyagi 9808578, Japan

[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[5] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[6] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[7] DuPont Co Inc, Expt Stn, Cent Res & Dev, Wilmington, DE 19880 USA

[8] MIT, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA

[9] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.72.195415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of nondegenerate pump-probe measurements were carried out on a DNA-wrapped single-walled carbon nanotube (SWNT) sample that is enriched with the (6,5) species. The pump pulse excites SWNTs at similar to 1.567 eV, which corresponds to an energy of two D-band phonons above the excitonic band edge of the (6,5) SWNT. The dynamics of different channels of exciton relaxation for the (6,5) SWNT is analyzed in terms of the decay in the time-resolved differential transmission spectra. By systematically varying the values of the probe energy, E-probe, to be in and out of resonance with the minority (n,m) SWNT species in the sample at different pump fluence levels, an intermediate decay component associated with a hot phonon-absorption process is studied in detail. When the values of E-probe were further tuned to off-resonance positions, photo-induced absorption processes could be investigated.

引用

页数：8

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