Zoran Arsov1, Tilen Koklič2. 1. Laboratory of Biophysics, Department of Condensed Matter Physics, Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia. zoran.arsov@ijs.si. 2. Laboratory of Biophysics, Department of Condensed Matter Physics, Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia. tilen.koklic@ijs.si.