Stability of High-Density One-Dimensional Excitons in Carbon Nanotubes under High Laser Excitation

G. N. Ostojic, S. Zaric, J. Kono, V. C. Moore, R. H. Hauge, and R. E. Smalley

Phys. Rev. Lett. 94, 097401 – Published 8 March 2005

Abstract

Through ultrafast pump-probe spectroscopy with intense pump pulses and a wide continuum probe, we show that interband exciton peaks in single-walled carbon nanotubes (SWNTs) are extremely stable under high laser excitations. Estimates of the initial densities of excitons from the excitation conditions, combined with recent theoretical calculations of exciton Bohr radii for SWNTs, suggest that their positions do not change at all even near the Mott density. In addition, we found that the presence of lowest-subband excitons broadens all absorption peaks, including those in the second-subband range, which provides a consistent explanation for the complex spectral dependence of pump-probe signals reported for SWNTs.

Received 30 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.097401

Authors & Affiliations

G. N. Ostojic, S. Zaric, and J. Kono^*

Department of Electrical and Computer Engineering, Rice Quantum Institute, and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA

V. C. Moore, R. H. Hauge, and R. E. Smalley

Department of Chemistry, Rice Quantum Institute, and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA

^*To whom correspondence should be addressed. Electronic address: kono@rice.edu Electronic address: http://www.ece.rice.edu/~kono

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Vol. 94, Iss. 9 — 11 March 2005

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