1. B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Nauki Ave., Kharkiv 61103, Ukraine
2. Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, Zagreb 10000, Croatia
3. Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34051, Republic of Korea
4. Physical Department, V.N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
5. Department of Physics, University of Gothenburg, SE-412 96 Göteborg, Sweden