1. The Nancy & Stephen Grand Technion Energy Program (GTEP), Technion − Israel Institute of Technology, Haifa 32000, Israel
2. Department of Materials Science and Engineering, Technion − Israel Institute of Technology, Haifa 32000, Israel
3. Solid State Institute and Physics Department, Technion−Israel Institute of Technology, Haifa 32000, Israel
4. Fourth Physical Institute, University of Göttingen, Göttingen 37077, Germany