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Title: Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes

Abstract

We report a femtosecond midinfrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement, and dynamics manifest the observation of quasi-one-dimensional intraexcitonic transitions. A model of the nanotube 1s-2p cross section agrees well with the signal amplitudes. Our study further reveals saturation of the photoinduced absorption with increasing phase-space filling of the correlated e-h pairs.

Authors:
 [1];  [2];  [3];  [3];  [2]
  1. ORNL
  2. Lawrence Berkeley National Laboratory (LBNL)
  3. University of California, Berkeley
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
983844
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 17; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ABSORPTION; AMPLITUDES; CARBON; CHIRALITY; CROSS SECTIONS; DYNAMICS; ENERGY; EXCITONS; NANOTUBES; OSCILLATOR STRENGTHS; PHASE SPACE; SATURATION; SIGNALS; SPECTROSCOPY; WELLS

Citation Formats

Ma, Yingzhong, Wang, Jigang, Graham, Matt, Fleming, Graham, and Kaindl, Robert. Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes. United States: N. p., 2010. Web.
Ma, Yingzhong, Wang, Jigang, Graham, Matt, Fleming, Graham, & Kaindl, Robert. Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes. United States.
Ma, Yingzhong, Wang, Jigang, Graham, Matt, Fleming, Graham, and Kaindl, Robert. Fri . "Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes". United States.
@article{osti_983844,
title = {Ultrafast Spectroscopy of Midinfrared Internal Exciton Transitions in Separated Single-Walled Carbon Nanotubes},
author = {Ma, Yingzhong and Wang, Jigang and Graham, Matt and Fleming, Graham and Kaindl, Robert},
abstractNote = {We report a femtosecond midinfrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement, and dynamics manifest the observation of quasi-one-dimensional intraexcitonic transitions. A model of the nanotube 1s-2p cross section agrees well with the signal amplitudes. Our study further reveals saturation of the photoinduced absorption with increasing phase-space filling of the correlated e-h pairs.},
doi = {},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 17,
volume = 104,
place = {United States},
year = {2010},
month = {1}
}