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).