〇HaiDang NGO^1,2, Kai Chen^1,3, Tung Anh Doan^1,2, Orjan S. Handegard^1,2, Thien Duc Ngo^1,2, Duy Thang Dao¹, Naoki Ikeda^1,4, Akihiko Ohi^1,4, Toshihide Nabatame^1,4, Tadaaki Nagao^1,2 (1.International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan, 2.Department of Condensed Matter Physics, Graduate school of Science, Hokkaido University, Kita-10 Nishi-8 Kita-ku, Sapporo 060-0810, Japan, 3.Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China, 4.Nanotechnology Innovation Station, National Institute for Materials Science, Tsukuba 305-0044, Japan)