Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes

Zipeng Zhu; Jared Crochet; Michael S. Arnold; Mark C. Hersam; Hendrik Ulbricht; Daniel Resasco; Tobias Hertel

doi:10.1021/jp0669411

Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes

Zipeng Zhu, Jared Crochet, Michael S. Arnold, Mark C. Hersam, Hendrik Ulbricht, Daniel Resasco, Tobias Hertel^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

111 Scopus citations

Abstract

We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump-probe spectroscopy. The ground state recovery is characterized by a t ^{-0.45 ± 0.03} power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright ₀A₀^- singlet excitons within the E₁₁ and E₂₂ manifolds exhibit a photobleach (PB) and a photoabsorption (PA) signal of similar strength. The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is attributed to a transition from the dark singlet exciton ₀A₀⁺ to a ₀A ₀^- + ₀A₀⁺ state within the two exciton E₁₁ manifold.

Original language	English (US)
Pages (from-to)	3831-3835
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	10
DOIs	https://doi.org/10.1021/jp0669411
State	Published - Mar 15 2007
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes",

abstract = "We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump-probe spectroscopy. The ground state recovery is characterized by a t -0.45 ± 0.03 power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright 0A0- singlet excitons within the E11 and E22 manifolds exhibit a photobleach (PB) and a photoabsorption (PA) signal of similar strength. The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is attributed to a transition from the dark singlet exciton 0A0+ to a 0A 0- + 0A0+ state within the two exciton E11 manifold.",

author = "Zipeng Zhu and Jared Crochet and Arnold, {Michael S.} and Hersam, {Mark C.} and Hendrik Ulbricht and Daniel Resasco and Tobias Hertel",

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language = "English (US)",

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T1 - Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes

AU - Zhu, Zipeng

AU - Crochet, Jared

AU - Arnold, Michael S.

AU - Hersam, Mark C.

AU - Ulbricht, Hendrik

AU - Resasco, Daniel

AU - Hertel, Tobias

PY - 2007/3/15

Y1 - 2007/3/15

N2 - We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump-probe spectroscopy. The ground state recovery is characterized by a t -0.45 ± 0.03 power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright 0A0- singlet excitons within the E11 and E22 manifolds exhibit a photobleach (PB) and a photoabsorption (PA) signal of similar strength. The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is attributed to a transition from the dark singlet exciton 0A0+ to a 0A 0- + 0A0+ state within the two exciton E11 manifold.

AB - We investigate exciton dynamics in isopycnically enriched (6,5) nanotube-DNA suspensions using femtosecond time-resolved pump-probe spectroscopy. The ground state recovery is characterized by a t -0.45 ± 0.03 power law behavior, indicative of a one-dimensional diffusion-limited reaction that is tentatively attributed to subdiffusive trapping of dark excitons. Spectral transients of bright 0A0- singlet excitons within the E11 and E22 manifolds exhibit a photobleach (PB) and a photoabsorption (PA) signal of similar strength. The PA is blue-shifted with respect to the PB-signal by 7.5 meV and is attributed to a transition from the dark singlet exciton 0A0+ to a 0A 0- + 0A0+ state within the two exciton E11 manifold.

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Pump-probe spectroscopy of exciton dynamics in (6,5) carbon nanotubes

Abstract

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