Stefan, an excellent German boy (middle) spent two and half years in the group of Professor DING (right) in China during his Ph. D researches. He acts as a ¡°linker¡± of the Chinese group and the German group headed by Professor Spatz (left).

Stefan had a great success in his Ph. D defence in Heidelberg, Germany in 2006. The work about the ¡°linker¡± was published in Nano Letters (2007).

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