1. National University of Science and Technology MISIS, 119049 Moscow, Russia
2. B. Verkin Institute for Low Temperature Physics and Engineering, NAS of Ukraine, 61103 Kharkov, Ukraine
3. Physikalisches Institute, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
4. Russian Quantum Center, 100 Novaya Street, Skolkovo, Moscow Region 143025, Russia