摘要
Moirésuperlattices,arising from the controlled twisting of van der Waals homostructures at specific angles,have emerged as a promising platform for quantum emission applications.Concurrently,the manipulation of strain provides a versatile strategy to finely adjust electronic band structures,enhance exciton luminescence efficiency,and establish a robust foundation for two-dimensional quantum light sources.However,the intricate interplay between strain and moirépotential remains partially unexplored.Here,we introduce a meticulously designed fusion of strain engineering and the twisted 2L-WSe_(2)/2L-WSe_(2) homobilayers,resulting in the precise localization of moiréexcitons.Employing low-temperature photoluminescence spectroscopy,we unveil the emergence of highly localized moiré-enhanced emission,characterized by the presence of multiple distinct emission lines.Furthermore,our investigation demonstrates the effective regulation of moirépotential depths through strain engineering,with the potential depths of strained and unstrained regions differing by 91%.By combining both experimental and theoretical approaches,our study elucidates the complex relationship between strain and moirépotential,thereby opening avenues for generating strain-induced moiréexciton single-photon sources.
基金
supported this research endeavor.Notably,the National Natural Science Foundation of China(No.52373311)
the Science Talent Program of China,the Hunan Provincial Science Fund for Distinguished Young Scholars(No.2020JJ2059)
the Hunan Province Key Research and Development Project(No.2019GK2233)
the Youth Innovation Team(No.2019012)of Central South University(CSU)have played an essential role in facilitating the success of this study.Furthermore,the Science and Technology Innovation Basic Research Project of Shenzhen(No.JCYJ20190806144418859)
the Key Program of the Science and Technology Department of Hunan Province(Nos.2019XK2001 and 2020XK2001)
the National Natural Science Foundation of China(Nos.62090035 and U19A2090)have also made significant contributions to the advancement of this work
The support provided by the High-Performance Complex Manufacturing Key State Lab Project at CSU(No.ZZYJKT2020-12)has been of immeasurable value,greatly expediting the research process
Acknowledgment is also extended to the Australian Research Council(ARC Discovery Project,DP180102976)for its pivotal role in driving forward this research agenda.Additionally
J.T.W.extends gratitude for the support received from the National Natural Science Foundation of China(Nos.92263202 and 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)
The authors also wish to convey their deep appreciation to the Beijing Super Cloud Computing Center(BSCC,http://www.blsc.cn)for granting access to high-performance computing(HPC)resources,which have been instrumental in yielding the research outcomes detailed in this paper.Finally,the authors hold profound gratitude for the support of the Postdoctoral Science Foundation of China(No.2022M713546)
a vital contribution that has substantially propelled the advancement of this research endeavor.This work was supported in part by the High-Performance Computing Center of Central South University.
