1. University of Picardie Laboratory of Condensed Matter Physics Amiens 80039 France
2. Faculty of Physics Southern Federal University 5 Zorge Street Rostov‐on‐Don 344090 Russia
3. Centre for Nanostructured Media School of Mathematics and Physics Queen's University Belfast Belfast BT7 1NN UK
4. Department of Physics and Astronomy University of Nebraska–Lincoln Lincoln NE 68588 USA
5. Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) Trondheim 7491 Norway
6. Jožef Stefan Institute Jamova Cesta 39 Ljubljana 1000 Slovenia
7. Terra Quantum AG Kornhausstrasse 25 St. Gallen CH‐9000 Switzerland
8. Physics Department City College of the City University of New York 160 Convent Avenue New York NY 10031 USA