1 Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518110, China; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
2 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
3 Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
4 Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China. Electronic address: hejq@sustech.edu.cn.