Exploring the regulatory effect of stacked layers on moiréexcitons in twisted WSe_(2)/WSe_(2)/WSe_(2)homotrilayer  

作　　者：Haihong Zheng Biao Wu Chang-Tian Wang Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Ji-an Duan 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 410083,China [2]State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,932 South Lushan Road,Changsha 410083,China [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]School of Chemical and Biomolecular Engineering,The University of Sydney,NSW 2006,Australia [6]The University of Sydney Nano Institute,The University of Sydney,NSW 2006,Australia [7]Songshan Lake Materials Laboratory,Dongguan 523808,China [8]Shenzhen Research Institute of Central South University,Shenzhen 518057,China

出　　处：《Nano Research》2023年第7期10573-10579,共7页纳米研究（英文版）

基　　金：The study presented herein was generously supported by multiple funding agencies,including the National Natural Science Foundation of China(No.61775241);the Hunan Province Key Research and Development Project(No.2019GK2233);the Hunan Provincial Science Fund for Distinguished Young Scholars(No.2020JJ2059);the National Natural Science Foundation of China(Nos.62090035 and U19A2090);the Youth Innovation Team(No.2019012)of CSU,the Key Program of Science and Technology Department of Hunan Province(Nos.2019XK2001 and 2020XK2001);the Science and Technology Innovation Basic Research Project of Shenzhen(No.JCYJ20190806144418859);the Postdoctoral Science Foundation of China(No.2022M713546);The authors also express their gratitude to the High-Performance Complex Manufacturing Key State Lab Project,Central South University(No.ZZYJKT2020-12);the Australian Research Council(ARC Discovery Project,DP180102976)for their support of ZWL;CTW is grateful for support from the National Natural Science Foundation of China(No.11974387);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB33000000);H.H.Z.acknowledges support from the Postdoctoral Science Foundation of China(No.2022M713546).

摘　　要：Moirésuperlattices in van der Waals structures have emerged as a powerful platform for studying the novel quantum properties of two-dimensional materials.The periodic moirépatterns generated by these structures lead to the formation of flat mini-bands,which alter the electronic energy bands of the material.The resulting flat electronic bands can greatly enhance strong correlative interactions between electrons,leading to the emergence of exotic quantum phenomena,including moiréphonons and moiréexcitons.While extensive research has been conducted on the exotic quantum phenomena in twisted bilayers of transition metal dichalcogenides(TMDs),and the regulatory effect of stacked layers on moiréexcitons remains unexplored.In this study,we report the fabrication of a twisted WSe_(2)/WSe_(2)/WSe_(2) homotrilayer with two twist angles and investigate the influence of stacked layers on moiréexcitons.Our experiments reveal multiple moiréexciton splitting peaks in the twisted trilayer,with moirépotential depths of 78 and 112 meV in the bilayer and trilayer homostructures,respectively.We also observed the splitting of the moiréexcitons at 90 K,indicating the presence of a deeper moirépotential in the twisted trilayer.Moreover,we demonstrate that stacked layers can tune the moiréexcitons by manipulating temperature,laser power,and magnetic field.Our results provide a new physical model for studying moirésuperlattices and their quantum properties,which could potentially pave the way for the development of quantum optoelectronics.

关 键 词：materials material field 

分 类 号：O469[理学—凝聚态物理]