Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 75, Issue 4, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.75.043709
Keywords
carbon nanotube; nonlinear optical response; optical Stark effect; exciton; pump-probe spectroscopy
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We report a splitting and a shift of exciton absorptions in semiconducting single-walled carbon nanotubes (SWNTs) by resonant and off-resonant excitation using a fs laser pulse, respectively. This is the first unambiguous observation of the optical Stark effect of excitons in SWNTs, which is responsible for their high optical-switching performance. By scrutinizing transient absorption spectra from the mid-to near-infrared region (0.1-0.8 eV), the ultrafast recovery of real carrier excitations characteristic of bundled structures was attributed to the energy- and charge-transfer processes to metallic SWNTs.
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