1. Chemical Physics and NanoLund, Lund University, P.O. Box 124, 22100 Lund, Sweden
2. School of Physics and Engineering, ITMO University, 49 Kronverksky, St. Petersburg 197101, Russian Federation
3. Chair for Emerging Electronic Technologies, Technical University of Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany
4. Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, 01069 Dresden, Germany