By Marco Saraniti, Umberto Ravaioli

"Nonequilibrium service Dynamics in Semiconductors" is a well-established, expert convention, held each years, overlaying a number of themes of present curiosity to R&D in semiconductor physics/materials, optoelectronics, nanotechnology, quantum info processing. Papers permitted for ebook are chosen and peer-reviewed via contributors of this system Committee in the course of the convention to make sure either swift and top quality processing.

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Extra info for Nonequilibrium Carrier Dynamics in Semiconductors: Proceedings of the 14th International Conference, July 25-29, 2005, Chicago, USA (Springer Proceedings in Physics)

Sample text

The nanostructures investigated in this study are self-organized InGaAs QDs grown on a GaAs. e. close to the optical phonon energies of GaAs The scheme of our experimental approach is displayed in the inset of Fig. 1(a). A pump pulse with a duration of 100 fs is tuned to the absorption continuum of the WL, thus resonantly creating electron-hole pairs. After relaxation towards the band edge, the carriers are transfered into fully quantized QD levels. Correspondingly, a transient optical bleaching signal is established reflecting the occupation of the electronic states.

Kuhn, B. Krummheuer and V. M. Axt created nor should they couple back to the QD. However, when the longitudinal waves originally emitted from the QD are reflected they are in part converted to transverse ones. In the next reflection these transverse phonons are again partially converted back into longitudinal ones, which then can interact with the QD. Since the transverse phonons travel slower than the longitudinal ones this dip occurs at a later time. The absorption spectrum of a QD in the center of a 20 nm slab is shown in Fig.

Rev. B 44, 10945 (1991) 10. T. R. , Phys. Rev. B 69, 235314 Influence of Surfaces on the Pure Dephasing of Quantum Dots T. Kuhn, B. Krummheuer and V. M. Axt Institut ftir Festkorpertheorie, Westfalische Wilhelms-Universitat Munster, Wilhelm-Klemm-Str. 10, 48149 Munster, Germany Summary. An analysis of the influence of confined acoustic phonons on the pure dephasing of a single quantum dot located in a half space or a free-standing slab is given. We find that the proximity to a surface leaves distinct traces in the polarization and the absorption spectrum which can be traced back to the interaction of the dot with surface phonons and a reflected phonon wave packet.

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