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Direct Observation of Dark Excitons in Individual Carbon Nanotubes: Role of Local Environments
We report the direct observation of the spin-singlet dark excitonic state in individual single-walled carbon nanotubes through low-temperature micro-photoluminescence spectroscopy in magnetic fields.
Ultrafast photoinduced above-bandgap transparency in GaAs due to the dynamic Franz-Keldysh effect
We report the dynamic Franz-Keldysh effect in bulk GaAs. Ultrafast changes in transmission spectra near the band edge, including the first observation of photoinduced transparency as large as 40% are
Mid-infrared ultrafast and nonlinear spectroscopy of semiconductors
Our recent experiments using 140 fs pulses of intense, coherent, and tunable mid-infrared (MIR) radiation produced by an optical parametric amplifier are described. These experiments explored MIR
Long-lived dilute photocarriers in individually-suspended single-walled carbon nanotubes
We have observed slow (> 1 ns) carrier decays in single-walled carbon nanotubes. This previously-unreported signal appears in a dilute limit and is accompanied by polarization memory, which persists
Direct measurement of dark-bright exciton splitting in individual single-walled carbon nanotubes
We have performed low-temperature micro-photoluminescence studies on individual single-walled carbon nanotubes in magnetic fields up to 5 T and directly measured the dark-bright exciton splitting