Affiliation: | Institut für Angewandte Physik, Universit?t Münster, Corrensstr. 2/4, D-48149 Münster, Germany (E-mail: morgner@uni-muenster.de), DE Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA, US Fachbereich Physik, Universit?t Rostock, Universit?tsstr. 3, D-18051 Rostock, Germany, DE
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