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 moiré potential and Coulomb interactions.The moiré superlattices act as a periodic confinement potential in space to capture interlayer excitons(IXs),resulting in moiré exciton arrays,which provide opportunities for quantum emitters and many-body physics.The observation of moiré IXs in twisted transition-metal dichalcogenide(TMD)heterostructures has recently been widely reported.However,the capture and study of the moiré intralayer excitons based on TMD twisted homobilayer(T-HB)remain elusive.Here,we report the observation of moiré intralayer excitons in a WSe2/WSe2 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 WSe2 exciton peaks.The split peaks were caused by the trapping of intralayer excitons via the moiré potential.The confinement effect of the moiré potential on the moiré intralayer 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.

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

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;State Key Laboratory of High-Performance Complex Manufacturing,Central South University,932 South Lushan Road,Changsha,Hunan 410083,China;Department of Applied Physics,School of Physics and Electronics,Hunan University,Changsha 410082,China;School of Chemical and Biomolecular Engineering,The University of Sydney,Sydney,NSW 2006,Australia;The University of Sydney Nano Institute,The University of Sydney,Sydney,NSW 2006,Australia;Hunan Institute of Optoelectronic Integration,College of Materials Science and Engineering,Hunan University,Changsha,Hunan 410082,China;Shenzhen Research Institute of Central South University,A510a,Virtual University Building,Southern District,High-tech Industrial Park,Yuehai Street,Nanshan District,Shenzhen,China

光：科学与应用（英文版）

[1]Biao Wu;Haihong Zheng;Shaofei Li;Junnan Ding;Jun He;Yujia Zeng;Keqiu Chen;Zongwen Liu;Shula Chen;Anlian Pan;Yanping Liu-.Evidence for moiré intralayer excitons in twisted WSe2/WSe2 homobi layer superlattices)[J].光：科学与应用（英文版）,2022(07):1493-1500

homobi,IXs,homobilayer

Evidence,moir,intralayer,excitons,twisted,WSe2,superlattices,Recent,advances,der,Waals,have,emerged,powerful,attractive,platform,exploring,novel,condensed,matter,physics,due,interplay,between,potential,Coulomb,interactions,periodic,confinement,space,capture,interlayer,resulting,arrays,which,provide,opportunities,quantum,emitters,many,body,observation,transition,metal,dichalcogenide,TMD,heterostructures,has,recently,been,widely,reported,However,study,HB,remain,elusive,Here,small,angle,by,measuring,PL,spectrum,multiple,split,peaks,energy,range,eV,are,different,from,that,monolayer,were,caused,trapping,via,effect,was,further,demonstrated,changing,temperature,laser,valley,polarization,Our,findings,new,avenue,correlated,phenomena,their,applications

0.480683