Effect of layered-coupling in twisted WSe_(2) moiré superlattices  

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

机构地区：[1]School of Physics and Electronics,Hunan Key Laboratory for Super-microstructure and Ultrafast Process,Central South University,Changsha 410083,China [2]State Key Laboratory of High-Performance Complex Manufacturing,Central South University,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 518000,China

出　　处：《Nano Research》2023年第2期3435-3442,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.61775241);Hunan province key research and development project(No.2019GK2233);Hunan Provincial Science Fund for Distinguished Young Scholars(No.2020JJ2059);the Youth Innovation Team(No.2019012)of CSU;the Science and Technology Innovation Basic Research Project of Shenzhen(No.JCYJ20190806144418859);the National Natural Science Foundation of China(Nos.62090035 and U19A2090);the Key Program of Science and Technology Department of Hunan Province(Nos.2019XK2001 and 2020XK2001);support of the High-Performance Complex Manufacturing Key State Lab Project,Central South University(No.ZZYJKT2020-12);the Australian Research Council(ARC Discovery Project,No.DP180102976);the National Natural Science Foundation of China(No.11974387);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB33000000);the National Key Research and Development Program of China(No.2020YFA0711502).

摘　　要：Recently,the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable attention.The introduction of small twist angles in transition metal dichalcogenide(TMD)heterostructures leads to the emergence of moirépotentials,which provide a fascinating platform for the study of strong interactions of electrons.While there has been extensive research on moiréexcitons in twisted bilayer superlattices,the capture and study of moiréexcitons in homostructure superlattices with layer-coupling effects remain elusive.Here,we present the observation of moiréexcitons in the twisted 1L-WSe_(2)/1L-WSe_(2)and 1L-WSe_(2)/2L-WSe_(2)homostructures with various layer-coupling interactions.The results reveal that the moirépotential increases(~260%)as the number of underlying layers decreases,indicating the effect of layer coupling on the modulation of the moirépotential.The effects of the temperature and laser power dependence as well as valley polarization on moiréexcitons were further demonstrated,and the crucial spectral features observed were explained.Our findings pave the way for exploring quantum phenomena and related applications of quantum information.

关 键 词：twisted homostructures moirésuperlattices moirépotential layer-coupling 

分 类 号：O43[机械工程—光学工程]