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Updated: Aug 16, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Intersubband exciton relaxation dynamics in single-walled carbon nanotubes
C Manzoni1, A Gambetta, E Menna
1Dipartimento di Fisica, Politecnico di Milano, ULTRAS-INFM, Piazza L. da Vinci 32, 20133 Milan, Italy.
Abstract:
We study exciton (EX) dynamics in single-walled carbon nanotubes (SWNTs) included in polymethylmethacrylate by two-color pump-probe experiments with unprecedented temporal resolution. In the semiconducting SWNTs, we resolve the intersubband energy relaxation from the EX2 to the EX1 transition and find time constants of about 40 fs. The observation of a photoinduced absorption band strictly correlated to the photobleaching of the EX1 transition supports the excitonic model for primary excitations in SWNTs. We also detect in the time domain coherent oscillations due to the radial breathing modes at approximately 250 cm(-1).
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