1. Faculty of Physics, Moscow State University, Leninskye Gory, 1, Building 2, Moscow 119991, Russia
2. Institution of Russian Academy of Sciences, Dorodnicyn Computing Centre of RAS, Vavilov St. 40, 119333 Moscow, Russia
3. Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany