By U. Zeitler, I. Hapke-Wurst, D. Sarkar, R. J. Haug, H. Frahm, K. Pierz, A. G. M. Jansen (auth.), Prof. Bernhard Kramer (eds.)

The current quantity comprises the written models of lots of the invited talks of the Spring assembly of the Condensed subject Physics component to the Deutsche Physikalische Gesellschaft held from March 25 to 29, 2002 in Regensburg, Germany. additionally contained are these talks provided as a part of the Symposia such a lot of which have been equipped via numerous divisions in collaboration and lined a desirable number of themes of present curiosity. hence this quantity displays the prestige of condensed subject physics in Germany within the 12 months 2002. specifically, one notes a mild switch in paradigms: from quantum dots and wires to spin shipping and delicate topic platforms within the broadest experience. This turns out to mirror the current basic development in physics. however, a wide component of the invited papers be aware of nanostructured matter.

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Schulz, U. W. Pohl, D. Bimberg, M. Klude, and D. Hommel, J. Cryst. Growth 214/215, 1054 (2000). 35 Photonic Crystals: Optical Materials for the 21st Century K. Busch, A. Garcia-Martin, D. Hermann, L. Tkeshelashvili, M. Frank, and P. W¨ olfle Institut f¨ ur Theorie der Kondensierten Materie, Universit¨ at Karlsruhe, 76128 Karlsruhe, Germany Abstract. We outline a theoretical framework that allows qualitative as well as quantitative analysis of the optical properties of Photonic Crystals (PCs) derived from solid state theoretical concepts.

The observed decrease in T0 above T = 100 K is attributed to the delocalisation of excitons and carriers from the QDs. e. the QW, resulting in 2D-like excitons/carriers. These experiments show, that localisation energy of excitons/carriers up to room temperature (RT) is problematically in ZnCdSe QD structures. Hence, it is essential to identify the origin and mechanisms of exciton/carrier mobility and, possible identifying means to preserve 0D behaviour up to RT. Such investigations on the localisation and mobility of 0D and 2D excitons are presented, now.

1. Emission spectra of different ZnSe-based laser diodes. The only difference between the structures concerns the Cd composition of the QW material 2 Optimization of CdSe Quantum Dot Structures for Application in a Laser Diode In this section we discuss the formation mechanism, properties and optimization of CdSe/Zn(S)Se QDs. Then we present the results of an electrically pumped CdSe QD laser diode in comparison to those of QW laser diodes. 1 Quantum Dot Formation in the System CdSe/ZnSe During the growth of CdSe on ZnSe a transition from a two- to a threedimensional surface is observed by means of reflection high-energy electron diffraction [8].

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