Abstract
We study light absorption mechanisms in semiconducting carbon nanotubes using low-temperature, single-nanotube photoluminescence excitation spectroscopy. In addition to purely electronic transitions, we observe several strong phonon-assisted bands due to excitation of one or more phonon modes together with the first electronic state. In contrast with a small width of emission lines (sub-meV to a few meV), most of the photoluminescence excitation features have significant linewidths of tens of meV. All of these observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron-phonon scattering.
| Original language | English |
|---|---|
| Article number | 127403 |
| Journal | Physical Review Letters |
| Volume | 94 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Apr 1 2005 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Single carbon nanotubes probed by photoluminescence excitation spectroscopy : The role of phonon-assisted transitions. / Htoon, H.; O'Connell, M. J.; Doom, S. K.; Klimov, Victor I.
In: Physical Review Letters, Vol. 94, No. 12, 127403, 01.04.2005.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Single carbon nanotubes probed by photoluminescence excitation spectroscopy
T2 - The role of phonon-assisted transitions
AU - Htoon, H.
AU - O'Connell, M. J.
AU - Doom, S. K.
AU - Klimov, Victor I
PY - 2005/4/1
Y1 - 2005/4/1
N2 - We study light absorption mechanisms in semiconducting carbon nanotubes using low-temperature, single-nanotube photoluminescence excitation spectroscopy. In addition to purely electronic transitions, we observe several strong phonon-assisted bands due to excitation of one or more phonon modes together with the first electronic state. In contrast with a small width of emission lines (sub-meV to a few meV), most of the photoluminescence excitation features have significant linewidths of tens of meV. All of these observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron-phonon scattering.
AB - We study light absorption mechanisms in semiconducting carbon nanotubes using low-temperature, single-nanotube photoluminescence excitation spectroscopy. In addition to purely electronic transitions, we observe several strong phonon-assisted bands due to excitation of one or more phonon modes together with the first electronic state. In contrast with a small width of emission lines (sub-meV to a few meV), most of the photoluminescence excitation features have significant linewidths of tens of meV. All of these observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron-phonon scattering.
UR - http://www.scopus.com/inward/record.url?scp=18144384425&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18144384425&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.94.127403
DO - 10.1103/PhysRevLett.94.127403
M3 - Article
C2 - 15903961
AN - SCOPUS:18144384425
VL - 94
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 12
M1 - 127403
ER -