Evidence for moiréintralayer excitons in twisted WSe_(2)/WSe_(2) homobi layer superlattices  

作　　者：Biao Wu Haihong Zheng Shaofei Li Junnan Ding Jun He Yujia Zeng Keqiu Chen Zongwen Liu Shula Chen Anlian Pan Yanping Liu 

机构地区：[1]School of Physics and Electronics,Hunan Key Laboratory for Super-microstructure and Ultrafast Process,Central South University,932 South Lushan Road,Changsha,Hunan 410083,China [2]State Key Laboratory of High-Performance Complex Manufacturing,Central South University,932 South Lushan Road,Changsha,Hunan 410083,China [3]Department of Applied Physics,School of Physics and Electronics,Hunan University,Changsha 410082,China [4]School of Chemical and Biomolecular Engineering,The University of Sydney,Sydney,NSW 2006,Australia [5]The University of Sydney Nano Institute,The University of Sydney,Sydney,NSW 2006,Australia [6]Hunan Institute of Optoelectronic Integration,College of Materials Science and Engineering,Hunan University,Changsha,Hunan 410082,China [7]Shenzhen Research Institute of Central South University,A510a,Virtual University Building,Southern District,High-tech Industrial Park,Yuehai Street,Nanshan District,Shenzhen,China

出　　处：《Light(Science & Applications)》2022年第7期1493-1500,共8页光（科学与应用)（英文版）

基　　金：support from the Naional Natural Science Foundation of China(Grant No.61775241);Hunan province key research and development project(Grant No.2019GK2233);Hunan Provincial Science Fund for Distinguished Young Scholars(Grant No.2020JJ2059);the Youth Innovaticn Team(Grant No.2019012)of CSU,the Science and Technolgy Innovaton Basic Research Project of Shenzhen(Grant No.JCY120190806144418859);the National Natural Science Foundation of China (Nos.62090035,U19A2090);the Key Program of Science and Technology Department of Hunan Province(2019XK2001,2020XK2001);support of the High-Performance Complex Manufacturing Key State Lab Project,Central South University(Grant No.ZZYJKT2020-12);ZWL.thanks the support from the Australian Research Council(ARC Discovery Project,DP180102976).

摘　　要：Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moirépotential and Coulomb interactions.The moirésuperlattices act as a periodic confinement potential in space to capture interlayer excitons(IXs),resulting in moiréexciton arrays,which provide opportunities for quantum emitters and many-body physics.The observation of moiréIXs in twisted transition-metal dichalcogenide(TMD)heterostructures has recently been widely reported.However,the capture and study of the moiréintralayer excitons based on TMD twisted homobilayer(T-HB)remain elusive.Here,we report the observation of moiréintralayer excitons in a WSe_(2)/WSe_(2) T-HB with a small twist angle by measuring PL spectrum.The multiple split peaks with an energy range of 1.55-1.73 eV are different from that of the monolayer WSe_(2) exciton peaks.The split peaks were caused by the trapping of intralayer excitons via the moirépotential.The confinement effect of the moirépotential on the moiréintralayer excitons was further demonstrated by the changing of temperature,laser power,and valley polarization.Our findings provide a new avenue for exploring new correlated quantum phenomena and their applications.

关 键 词：TWISTED LAYER quantum 

分 类 号：O43[机械工程—光学工程]