1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic 1 , v.v.i., Dolejškova 3, 18223 Prague 8, Czech Republic
2. Faculty of Mathematics and Physics, Charles University 2 , Prague, Czech Republic
3. Faculty of Science, Charles University 3 , Prague, Czech Republic
4. Strongly Correlated Systems “Lendület” Research Group, Wigner Research Centre for Physics 4 , H-1525 Budapest, Hungary
5. Institute for Advanced Study, Technical University of Munich, Germany 5 , Lichtenbergstrasse 2a, 85748 Garching, Germany