Affiliation: | (1) Fock Institute of Physics, St. Petersburg State University, ul. Ul’yanovskaya 1, Petrodvorets, St. Petersburg, 198904, Russia;(2) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(3) Department of Physics, University of Bath, Bath, UK;(4) Institut Néel, CNRS/UJF, Grenoble, 38042, France |