1. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
2. Vishwakarma Institute of Information Technology, S. No. 2/3/4, Kondhwa (Bk), Pune 411 048, India
3. Low Temperature Center, Osaka University, Toyonaka, Osaka 560-0043
4. KYOKUGEN, Osaka University, Toyonaka, Osaka 560-0043