1. Graduate School of System Informatics, Kobe University, Kobe 657-8501, Japan
2. Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
3. Collaboratory for Advanced Computing and Simulations, Department of Physics and Astronomy, Department of Computer Science, and Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-0242, USA