Publication
1 School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 2 State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China 3Faculty of Applied Science (IMTEK), University of Freiburg, Georges-Kohler-Allee 103, 79110 Freiburg, Germany 4Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne, Switzerland 5Research Center for Integrated Quantum Electronics, Hokkaido University, North 13, West 8, Sapporo 060-8628, Japan 6Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China