1. Center for Computational Sciences, University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan
2. Department of Materials Science and Tsukuba Research Center for Energy Materials Science, Institute of Pure and Applied Sciences and R&D Center for Zero CO2 Emission with Functional, Tsukuba, Ibaraki 305-8573, Japan
3. Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan