1. Center for Computational Sciences, University of Tsukuba, 1–1–1 Tennodai, Tsukuba, Ibaraki 305–8577, Japan
2. Master's Program in Physics, Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, 1–1–1 Tennodai, Tsukuba, Ibaraki 305–8577, Japan