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We demonstrate the ultrafast coherent dynamics of exciton wavepackets in semiconductor QWs resonantly driven by strong narrowband THz pulses. Time-resolved THz-pump and optical-probe measurements exhibit large-signal nonlinear optical transients of the HH and LH exciton lines in GaAs/AlGaAs QWs.
Quasicrystals based on the excitonic resonances of GaAs/AlGaAs quantum wells were grown with spacings that satisfy a Fibonacci sequence. Linear and nonlinear reflectivity and photoluminescence measurements were performed, agreeing quite well with theory.
We investigate the coherent dynamics of excitonic wavepackets in semiconductors driven by intense narrowband THz pulses. Time-resolved THz-pump and optical-probe measurements demonstrate strong nonlinear-optical transients of the light-hole and heavy-hole excitonic resonances in GaAs/AlGaAs QWs.
This paper summarizes a consistent microscopic approach that allows for predictive calculations of laser gain/absorption, photoluminescence, and the intrinsic laser loss processes. The theory is first evaluated for an (AlGaIn)As quantum well system used in a vertical-external-cavity surface-emitting laser structure. Good agreement with experimental results is demonstrated. In a second application,...
We investigate coherent THz-induced dynamics for optical excitation in semiconductor quantum-wells via THz-pump and optical-probe experiments. Strong single-cycle THz pulses induce transient spectral-shifts and broadening of the light-hole and heavy-hole excitonic resonances in GaAs/AlGaAs quantum-wells.
We investigate a series of Ga(AsSb)/GaAs/AlGaAs quantum wells, that show an additional inplane confinement. This is attributed to the formation of self-organized GaAsSb quantum-islands during growth with confinement energies of several hundred meV.
An excitonic blue-shift is observed when a GaAs/AlGaAs superlattice is irradiated with a strong THz field. This observation is compared with a microscopic calculation, and is consistent with the onset of dynamical localization
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