[1] Ctr Energy Res, Inst Tech Phys & Mat Sci, Nanotechnol Dept, NanoFab ERC Res Grp 2D, POB 49, H-1525 Budapest, Hungary
[2] Eotvos Univ ELTE, Dept Biol Phys, Pazmany Peter Setany 1, H-1117 Budapest, Hungary
[3] Korea Res Inst Stand & Sci, Ctr Nanometrol, Daejeon 305340, South Korea
[4] Ctr Energy Res, Inst Tech Phys & Mat Sci, Nanotechnol Dept, POB 49, H-1525 Budapest, Hungary