Advances in Solid State Physics 48 by Rolf Haug

By Rolf Haug

The 2008 Spring assembly of the Arbeitskreis Festkörperphysik used to be held in Berlin, Germany, among February 24 and February 29, 2008 along with the 72nd Annual assembly of the Deutsche Physikalische Gesellschaft. The 2008 assembly used to be the biggest physics assembly in Europe and one of the biggest physics conferences on this planet in 2008.

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3 Single ZnO pillars as nano-resonators In order to get insight into the modal structure of ZnO nano-resonators and their dependence on geometrical and optical parameters, investigations on individual nanorods are required. A growth method was developed in our group which allows growth of well-faceted ZnO pillars with hexagonal cross section and average distances above 1 μm [23]. g. by the focused ion beam (FIB) technique, and individual pillars can then be retrieved both in optical experiments in a confocal microscope and in an electron microscope for CL measurements and precise structural characterization.

Spirkoska et al. 31. M. A. Sanchez-Garcia, E. Calleja, E. Monroy, F. J. Sanchez, F. Calle, E. Muñoz, R. com/science/article/B6TJ6-3W8STD4-4/ 1/ceb4d2577504cc8815a0de8507ed2712 32. L. Cerutti, J. Ristić, S. Fernández-Garrido, E. Calleja, A. Trampert, K. H. Ploog, S. Lazic, J. M. APL/88/213114/1 33. Y. Cui, X. Duan, J. Hu, C. 1021/ jp0009305 34. -K. Lew, L. Pan, T. E. Bogart, S. M. Dilts, E. C. Dickey, J. M. Redwing, Y. Wang, M. Cabassi, T. S. Mayer, S. W. APL/85/3101/1 35. S. Bae, C. Na, J. Kang, J.

At pumping levels above 70 kW/cm2 , a super-linear increase in the emitted intensity as a function of pumping power was detected and assigned to exciton–exciton scattering processes. For still higher pumping with 200 kW/cm2 , sharp emission peaks superimposed on a broad band at 386 nm were found and ascribed to EHP-driven stimulated emission. Surprisingly, the PL lifetime was reported to increase by some 20% for higher pumping levels, in our opinion contradicting real laser activity. Also simple pellets pressed from ZnO powder can serve as a laser active medium, as reported by Sun et al.

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