1 Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria.
2 Phystech School of Biological, and Medical Physics, Moscow Institute of Physics and Technology, National Research University, 9 Institutskiy per., 141701 Dolgoprudny, Russia.
3 Russian Quantum Center, Skolkovo Innovation City, 30 Bolshoy Bulvar, 121205 Moscow, Russia.
4 Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, National Research University, 9 Institutskiy per., 141701 Dolgoprudny, Russia.