1. Bogolyubov Institute for Theoretical Physics, Kyiv 03143, Ukraine
2. Bogolyubov Institute for Theoretical Physics, Kyiv 03143, Ukraine and Leibniz-Institut für Festkörper- und Werkstoffforschung, IFW Dresden, Dresden D-01171, Germany
3. Physics Institute, University of Bayreuth, Bayreuth 95440, Germany
4. Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine
5. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
6. Helmholtz-Zentrum Dresden-Rossendorf e. V., Institute of Ion Beam Physics and Materials Research, Dresden 01328, Germany