1. Chair for Emerging Electronic Technologies, Technical University of Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany
2. Kirchhoff Institute for Physics, University of Heidelberg, Heidelberg, Germany
3. Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
4. Chemical Physics and NanoLund, Lund University, Lund, Sweden
5. Dresden Center for Nanoanalysis, Technical University of Dresden, Dresden, Germany