1. Fachbereich Physik, Freie Universität Berlin 1 , Arnimallee 14, 14195 Berlin, Germany
2. Max Planck Institute for Polymer Research 2 , Ackermannweg 10, 55128 Mainz, Germany
3. Institute of Theoretical and Computational Physics, Graz University of Technology 3 , Graz, Austria
4. Laboratory of Computational Science and Modeling, IMX, Ecole Polytechnique Federale de Lausanne 4 , 1015 Lausanne, Switzerland