1. Institute of Nanotechnology, Electronics and Electronic Equipment Engineering, Southern Federal University, Shevchenko, 2, Taganrog 347928, Russia
2. Department of Physical Electronics, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Politekhnicheskaya 29, Russia
3. Electronic Materials Research Laboratory, Xi’an Jiaotong University, 710049, No.28, Xianning West Road, Xi’an, Shaanxi, P. R. China