1. Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, Dresden 01328, Germany
2. Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine
3. Institute for Theoretical Solid State Physics, IFW Dresden, Dresden 01069, Germany
4. Bogolyubov Institute for Theoretical Physics of National Academy of Sciences of Ukraine, Kyiv 03143, Ukraine
5. Institute for Theoretical Physics, TU Dresden, Dresden 01069, Germany