1. ZIK
SiLi-nano, Martin Luther University, Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Strasse
3, D-06120, Halle
(Saale), Germany
2. Institute
for Physics of Microstructures, Russian Academy of Sciences, GSP-105 Nizhniy Novgorod, Russia
3. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany
4. Centre
for Microscopy, Characterisation and Analysis, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia
5. Insitute
of Physics, Martin Luther University, Halle-Wittenberg, Von-Danckelmann-Platz
3, D-01620 Halle
(Saale), Germany