1. Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rakpart 3., H-1111 Budapest, Hungary
2. Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, PO. Box 49, H-1525 Budapest, Hungary
3. Stavropoulos Center for Complex Quantum Matter, Department of Physics, University of Notre Dame, Notre Dame, South Bend, Indiana 46556, United States
4. Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3., H-1111 Budapest, Hungary
5. Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3., H-1111 Budapest, Hungary