揭示硫空位对作为单层 WS2 中明亮稳定的色心
Nature Communications
(
IF
14.7
)
Pub Date : 2024-11-02
, DOI:
10.1038/s41467-024-53880-4
Huacong Sun, Qing Yang, Jianlin Wang, Mingchao Ding, Mouyang Cheng, Lei Liao, Chen Cai, Zitao Chen, Xudan Huang, Zibing Wang, Zhi Xu, Wenlong Wang, Kaihui Liu, Lei Liu, Xuedong Bai, Ji Chen, Sheng Meng, Lifen Wang
由零维缺陷产生的色心利用量子限制来获得内部电子量子自由度，开荒保洁13825404095为量子技术提供了潜力。尽管进行了深入的研究，但许多色心的结构起源仍然难以捉摸。在这项研究中，我们采用原位阴极发光扫描透射电子显微镜结合集成差分相差成像来研究硫化钨中的缺陷构型如何决定色心发射。使用 80 kV 加速电子束，在 hBN|WS2 系列 |100 K 时的 hBN 异质结构。这些颜色中心同时通过阴极发光显微镜测量，并通过机器学习进行区分。在 DFT 计算的支持下，我们的结果确定了一个关键的硫空位构型，该构型被组织成特征空位对，在 660 nm 处产生稳定而明亮的发光。这些发现阐明了色心的原子级结构-激子关系，促进了我们对二维材料中缺陷的理解和量子应用。
Unveiling sulfur vacancy pairs as bright and stable color centers in monolayer WS2
Color centers, arising from zero-dimensional defects, exploit quantum confinement to access internal electron quantum degrees of freedom, holding potential for quantum technologies. Despite intensive research, the structural origin of many color centers remains elusive. In this study, we employ in-situ cathodoluminescence scanning transmission electron microscopy combined with integrated differential phase contrast imaging to examine how defect configuration in tungsten sulfide determines color-center emission. Using an 80-kV accelerated electron beam, defects were deliberately produced, visualized, excited in situ and characterized in real time in monolayer WS2 within hBN|WS2 | hBN heterostructures at 100 K. These color centers were simultaneously measured by cathodoluminescence microscopy and differentiated by machine learning. Supported by DFT calculations, our results identified a crucial sulfur vacancy configuration organized into featured vacancy pairs, generating stable and bright luminescence at 660 nm. These findings elucidate the atomic-level structure-exciton relationship of color centers, advancing our understanding and quantum applications of defects in 2D materials.
