1. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences
2. Czech Republic
3. Dipartimento di Matematica e Fisica “E. De Giorgi”
4. Università del Salento
5. 73100 Lecce
6. Institute of Physics of the Czech Academy of Sciences
7. Prague 8
8. Department of Condensed Matter Physics
9. Faculty of Mathematics and Physics
10. Charles University
11. 121 16 Prague 2
12. Italy
13. Istituto di Nanotecnologia CNR-Nanotec