1. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, ul. Grudzia̧dzka 5, 87-100 Toruń, Poland
2. Strongly Correlated Systems “Lendület” Research Group, Wigner Research Center for Physics, H-1525 Budapest, Hungary
3. Department of Physics of Complex Systems, Eötvös Loránd University, Pf. 32, H-1518 Budapest, Hungary
4. Institute for Advanced Study, Technical University of Munich, 80333 Munich, Germany