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We show theoretically how electrical and pure spin AC currents can be optically injected in semiconductors via excitation of continuum carriers. The electrical current should be observable by detecting its THz radiation.
We have successfully determined the anharmonic decay time of coherent longitudinal-acoustic-phonons in GaN. The temperature dependent anharmonic decay behavior is found to agree well with the Herringpsilas theory even up to the sub-THz frequency regime.
We investigated many-body and radiative coupling effects on intersubband Rabi oscillations in a multiple quantum well system. Under certain conditions, radiative coupling is the dominating effect, yielding distinctively different excitation behaviors in the wells.
We report holographic recording of second harmonic radiations emitted from nanocrystals under femtosecond laser excitation. Our results show great promise of this novel technique to provide four-dimensional images for highly dynamic micro- and nano-systems.
We have designed a compact solid compressor by stimulated Brillouin scattering used in a fused silica glass. An 13 ns Nd:YAG laser pulse has been temporally compressed to a 1.2 ns pulse at 1064 nm.
Using density-matrix theory, the nonlinear optical and transport properties of quantum cascade lasers are investigated. Damping of the optically induced coherence is discussed and experimentally observed wave packet propagation is studied in pump-probe signals.
The role of polarons in the quantum kinetics of carrier-phonon interaction is emphasized. Scattering processes involving polarons allow ultrafast relaxation even if the phonon energy is not resonant with the electronic transitions.
We demonstrate possibility of multi-MeV electron acceleration and ultra-short electron bunch formation in the most basic ldquotransverserdquo geometry of an electron beam and tightly focused laser beam whereby the beams propagate normally to each other.
Ballistic pure spin currents generated via quantum interference in the absorption of femtosecond pulses are demonstrated to produce transverse ballistic Hall pure charge currents and vice versa via spin-dependent asymmetric scattering processes.
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.
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