1. CAS Center for Excellence in NanoscienceBeijing Key Laboratory of Micro‐nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences Beijing 100083 P. R. China
2. School of Nanoscience and TechnologyUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang University Hangzhou 310027 China
4. State Key Laboratory for Mesoscopic PhysicsCollaborative Innovation Centre of Quantum MatterSchool of PhysicsPeking University Beijing 100871 China
5. College of Optoelectronic EngineeringShenzhen University Shenzhen 518060 P. R. China
6. Center on Nanoenergy ResearchSchool of Physical Science and TechnologyGuangxi University Nanning Guangxi 530004 P. R. China