1. Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz4040, Austria
2. Secure and Correct Systems Lab, Linz Institute of Technology, 4040Linz, Austria
3. Theoretische Physik III, Universität Bayreuth, 95440Bayreuth, Germany
4. Institute of Theoretical Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
5. School of Physics, Southeast University, Nanjing211189, China
6. Forschungszentrum Mikrotechnik, FH Vorarlberg, 6850Dornbirn, Austria
7. Condensed Matter Theory, TU Dortmund, 44221Dortmund, Germany