1. Center for Energy and Advanced Materials Science, National Laboratory of Astana, Nazarbayev University 1 , Kabanbay Batyr Ave. 53, 010000 Astana, Kazakhstan
2. Department of Physics, School of Sciences and Humanities, Nazarbayev University 2 , Kabanbay Batyr Ave. 53, 010000 Astana, Kazakhstan
3. Department of Physics and Centre for Materials Science and Nanotechnology, University of Oslo 3 , N-0316 Oslo, Norway
4. Intel Corporation 4 , Chandler, Arizona 85226, USA