TY - JOUR
T1 - Ultrafast spectroscopy of midinfrared internal exciton transitions in separated single-walled carbon nanotubes
AU - Wang, Jigang
AU - Graham, Matt W.
AU - Ma, Yingzhong
AU - Fleming, Graham R.
AU - Kaindl, Robert A.
PY - 2010/4/26
Y1 - 2010/4/26
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77951558549&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.104.177401
DO - 10.1103/PhysRevLett.104.177401
M3 - Article
AN - SCOPUS:77951558549
SN - 0031-9007
VL - 104
JO - Physical Review Letters
JF - Physical Review Letters
IS - 17
M1 - 177401
ER -