Localization-enhanced moiréexciton in twisted transition metal dichalcogenide heterotrilayer superlattices  

作　　者：Haihong Zheng Biao Wu Shaofei Li Junnan Ding Jun He Zongwen Liu Chang-Tian Wang Jian-Tao Wang Anlian Pan Yanping Liu 

机构地区：[1]School of Physics and Electronics,Hunan Key Laboratory for Supermicrostructure and Ultrafast Process,Central South University,932 South Lushan Road,410083 Changsha,Hunan,China [2]State Key Laboratory of HighPerformance Complex Manufacturing,Central South University,932 South Lushan Road,410083 Changsha,Hunan,China [3]School of Chemical and Biomolecular Engineering,The University of Sydney,Sydney,NSW 2006,Australia [4]The University of Sydney Nano Institute,The University of Sydney,Sydney,NSW 2006,Australia [5]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,100190 Beijing,China [6]School of Physical Sciences,University of Chinese Academy of Sciences,100049 Beijing,China [7]Songshan Lake Materials Laboratory,523808 Dongguan,Guangdong,China [8]Hunan Institute of Optoelectronic Integration,College of Materials Science and Engineering,Hunan University,410082 Changsha,Hunan,China [9]Shenzhen Research Institute of Central South University,518000 Shenzhen,China

出　　处：《Light(Science & Applications)》2023年第6期1020-1028,共9页光（科学与应用)（英文版）

基　　金：The authors express their gratitude to various organizations for their support in this research,including the National Natural Science Foundation of China(Grant No.61775241);the Hunan province key research and development project(Grant No.2019GK2233);the Hunan Provincial Science Fund for Distinguished Young Scholars(Grant No.2020JJ2059);the Youth Innovation Team(Grant No.2019012)of CSU.Additionally,they acknowledge the Science and Technology Innovation Basic Research Project of Shenzhen(Grant No.JCYJ20190806144418859);the National Natural Science Foundation of China(Nos.62090035 and U19A2090);the Key Program of Science and Technology Department of Hunan Province(2019XK2001,2020XK2001);The authors also thank the High-Performance Complex Manufacturing Key State Lab Project of Central South University(Grant No.ZZYJKT2020-12)for their support.Z.W.L;acknowledges the support from the Australian Research Council(ARC Discovery Project,DP180102976);C.T.W.is grateful for the support from the National Natural Science Foundation of China(Grant No.11974387);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33000000);H.H.Z.acknowledges the support from the Postdoctoral Science Foundation of China(2022M713546).Finally,the authors recognize the Beijing Super Cloud Computing Center(BSCC)for providing HPC resources,which have greatly contributed to the results reported in this paper.

摘　　要：The stacking of twisted two-dimensional(2D)layered materials has led to the creation of moirésuperlattices,which have become a new platform for the study of quantum optics.The strong coupling of moirésuperlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states,including unconventional superconductivity,Mott insulating states,and moiréexcitons.However,the impact of adjusting and localizing moiréexcitons in Van der Waals heterostructures has yet to be explored experimentally.Here,we present experimental evidence of the localization-enhanced moiréexcitons in the twisted WSe_(2)/WS_(2)/WSe_(2)heterotrilayer with type-II band alignments.At low temperatures,we observed multiple excitons splitting in the twisted WSe_(2)/WS_(2)/WSe_(2)heterotrilayer,which is manifested as multiple sharp emission lines,in stark contrast to the moiréexcitonic behavior of the twisted WSe_(2)/WS_(2)heterobilayer(which has a linewidth 4 times wider).This is due to the enhancement of the two moirépotentials in the twisted heterotrilayer,enabling highly localized moiréexcitons at the interface.The confinement effect of moirépotential on moiréexcitons is further demonstrated by changes in temperature,laser power,and valley polarization.Our findings offer a new approach for localizing moiréexcitons in twist-angle heterostructures,which has the potential for the development of coherent quantum light emitters.

关 键 词：TWISTED LAYER QUANTUM 

分 类 号：O43[机械工程—光学工程]