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

Abstract

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

Keywords

ExcitonCarbon nanotubeExcitationMaterials scienceBiexcitonSpectroscopyUltrashort pulseLaserBohr modelAtomic physicsAbsorption spectroscopyMolecular physicsOptical properties of carbon nanotubesAbsorption (acoustics)Condensed matter physicsNanotubeNanotechnologyPhysicsOptics

Affiliated Institutions

Rice University US

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Publication Info

Year: 2005
Type: article
Volume: 94
Issue: 9
Citations: 65
Access: Closed

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APA Style

                            
                                
                                    G. N. Ostojic, 
                                
                                    S. Zaric, 
                                
                                    Junichiro Kono
                                
                                et al.
                            
                            (2005). 
                            Stability of High-Density One-Dimensional Excitons in Carbon Nanotubes under High Laser Excitation. 
                            Physical Review Letters
                            , 94
                            (9)
                            .
                            https://doi.org/10.1103/physrevlett.94.097401
                        

Identifiers

DOI: 10.1103/physrevlett.94.097401