1. State Key Laboratory of Crystal MaterialsInstitute of Crystal MaterialsShandong University Jinan 250100 China
2. Collaborative Innovation Center for Optoelectronic Science and TechnologyInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationShenzhen University Shenzhen 518060 China
3. Department of PhotonicsNational Sun Yat‐Sen University Kaohsiung 80424 Taiwan