1. a Department of Electronic Engineering , Faculty of Engineering, Osaka University , 2-1 Yamada-Oka, Suita, Osaka , 565-0871 , Japan
2. b Faculty of Engineering , Kyoto University , Kyoto , 606-01 , Japan
3. c Department of Physics , University of Utah , Salt Lake City , Utah , 84112 , USA
4. d Department of Thermophysics , Uzbek Academy of Science , Tashkent , 700135 , Uzbekistan