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Stimulated THz emission from intra-excitonic 3p to 2s transitions in Cu2O is directly observed by ultrafast opto-electronics. The process occurs at a photon energy of 6.6 meV, with a cross section of ~10-14 cm2.
Sub-10-fs visible pulses allow real time detection of coherent phonons in single-walled carbon nanotubes. Nonlinear coupling between radial breathing (250 cm-1) and the carbon-stretching (1600 cm-1) modes is experimentally observed and theoretically modeled.
Ultrathin films of cyanine dye J-aggregates show extraordinary exciton cross sections. Exciton dynamics are studied by ultrafast pump-probe and transient photoluminescence spectroscopy. An exciton delocalization length of N=18 monomers was measured at room temperature.
The spin relaxation within the radiative doublet of the exciton ground state in InAs/GaAs quantum dots is studied via ultrafast spectral hole burning spectroscopy. A biexcitonic resonance emerges due to relaxation of the exciton spin.
We propose an optical scheme to probabilistically initialize and rotate the electron spin in a quantum dot using charged exciton states. Our proposal makes use of the properties of the sech pulses for two-level systems.
Spatio-temporal dynamics of coherent exciton-polariton populations in semiconductor microcavities shows a rich ultrafast behaviour that presages many of the features of coherent matter condensates. For condensates at room temperature the response is necessarily ultrafast.
The two photon absorption coefficient at 1:55 eV of CdSe nanoparticles was determined from the induced transient bleaching of their first exciton transitions by a femtosecond white light probe. Dependence on particle size was investigated.
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