1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
2. Faculty of Mathematics and Physics, Charles University, 11636 Prague, Czech Republic
3. Strongly Correlated Systems “Lendület” Research group, Wigner Research Centre for Physics, H-1525 Budapest, Hungary
4. Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
5. Max Planck Institüt für Festkörperforschung, 70569 Stuttgart, Germany