1. Research Center for Electronic and Optical Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
2. Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3. Center for Basic Research on Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
4. Institute for Photon Science and Technology, The University of Tokyo, 7-3-1 Hongo Bunkyo, Tokyo 113-0033, Japan
5. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo Bunkyo, Tokyo 113-8656, Japan
6. Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
7. Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
8. Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
9. Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials (AI-MAT), National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan