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Summary form only given. There is intense current interest in the dynamical properties of self-organized InAs quantum dots from fundamental and applied viewpoints. We report here measurement and analysis of the depopulation dynamics of the lowest electronic states following resonant excitation by a femtosecond pulse. Our results, obtained by using a high-sensitivity differential transmission technique...
Summary form only given. Ultrafast spectroscopy offers a unique perspective into the role of many-body effects by providing time resolution shorter than the scattering times among the elementary excitations of the system. In modulation-doped quantum wells (QWs), the optical properties are dominated by the Fermi edge singularity (FES). Unlike in the undoped case, the FES is a continuum resonance whose...
Summary form only given. Recent experiments have revealed ultrafast optically-induced dynamics in the time-resolved magneto-optical (MO) signals obtained in metallic ferromagnetic samples. The very short time scales that have been reported seem to exclude the role of spin-lattice interactions in the dynamics and open several fundamental questions about the physical mechanism responsible for fast demagnetization...
Summary form only given. Infrared-visible sum-frequency generation (SFG) has been proven to be a powerful probe for vibrational spectroscopic investigation of surfaces and interfaces. It is highly surface specific and has a submonolayer sensitivity. As a nonlinear optical process, SFG puts a premium on high input beam intensities. One would therefore like to employ input pulses as short as possible...
Summary form only given. We have calculated the spin lifetimes for GaAs/AlGaAs and InGaAs/InP quantum wells using a fourteen bulk band basis which accounts for the zincblende symmetry of the heterostructure constituents. The spin lifetimes agree with recent experiments within a factor of two, indicating the importance of accurate band structure calculations for zincblende type heterostructures.
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