1. Institute for Physics of Microstructures, RAS, Afonino, Nizhny Novgorod 603087, Russia
2. Laboratory of Functional Nanomaterials, Lobachevsky State University, Nizhny Novgorod 603950, Russia
3. Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia
4. Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, SB RAS, Kol’tsovo 630559, Russia