Dynamic control of moirépotential in twisted WS_(2)-WSe_(2)heterostructures  

作　　者：Shaofei Li Haihong Zheng Junnan Ding Biao Wu Jun He Zongwen Liu 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]School of Chemical and Biomolecular Engineering,The University of Sydney,NSW 2006,Australia [4]The University of Sydney Nano Institute,The University of Sydney,NSW 2006,Australia [5]Shenzhen Research Institute of Central South University,Shenzhen 518057,China

出　　处：《Nano Research》2022年第8期7688-7694,共7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);the support of the High-Performance Complex Manufacturing Key State Lab Project,Central South University(No.ZZYJKT2020-12);Z.W.L.thanks the support from the Australian Research Council(ARC Discovery Project,DP180102976).

摘　　要：Moirésuperlattices are formed by a lattice mismatch or twist angle in two-dimensional materials,which can generate periodical moirépotentials leading to strong changes in the band structure,resulting in new quantum phenomena.However,the experimental engineering of in-situ deformation of moiréheterostructures remains deficient.Here,we demonstrate a dynamic local deformation of the twisted heterostructures using a diamond anvil cell(DAC),enabling in-situ dynamic modulation of moirépotential in twisted WS_(2)–WSe_(2)heterostructures at room temperature.Deformation of the twisted heterostructure increases the moirépotential,causing a red shift of the moiréexciton resonance,and observed the red shift of the intralayer exciton resonance up to 16.3 meV(less than 1.1 GPa).The blue shift of the interlayer excitons of twisted WS_(2)–WSe_(2)heterostructures shows an evident transition of the pressure sensitive exciton,induced by the dominant effect of modifying the band structure on optical properties.Combined with the spectral changes of pressurized Raman,which further demonstrated that the DAC can efficiently regulate the interlayer coupling.Our results offer an effective strategy for in-situ dynamic modulation of moirépotential,providing a promising platform for the development of novel quantum devices.

关 键 词：moirésuperlattices twisted heterostructures moirépotential diamond anvil cell(DAC) 

分 类 号：O43[机械工程—光学工程]