1. Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
2. Department of Physics, Nanjing University, Nanjing 210093, China
3. Department of Physics, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
4. Advanced Center for Computing and Communication, RIKEN, Wako Saitama 351-0198, Japan