Xiang Yubei, Shinokita Keisuke, Watanabe Kenji, Taniguchi Takashi, Matsuda Kazunari
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Sci Adv. 2025 Jun 6;11(23):eadr5562. doi: 10.1126/sciadv.adr5562. Epub 2025 Jun 4.
Quantum light sources, especially single-photon emitters, are crucial for advancing quantum technologies. Despite extensive research, the behavior of defect-localized excitons in monolayer WSe under external perturbations, such as magnetic fields, remain underexplored. This study investigates the nature and dynamics of defect-localized excitons under in-plane magnetic fields using steady-state and time-resolved photoluminescence (PL) spectroscopy. Observations reveal a sharp PL peak, indicative of single-photon emission, with doublet peaks from hybridized spin-state excitons. Notably, magnetic brightening of the PL peak was detected at a low magnetic field (<1 tesla), and the dynamics of hybridized-state excitons under magnetic fields indicated field-induced state mixing, explaining the magnetic brightening. These findings advance tunable single-photon emitters controlled by magnetic fields, with implications for quantum optics applications.
量子光源，尤其是单光子发射器，对于推动量子技术发展至关重要。尽管进行了广泛研究，但在诸如磁场等外部扰动下，单层WSe中缺陷局域激子的行为仍未得到充分探索。本研究使用稳态和时间分辨光致发光（PL）光谱研究了面内磁场下缺陷局域激子的性质和动力学。观察结果显示出一个尖锐的PL峰，表明单光子发射，以及来自杂化自旋态激子的双峰。值得注意的是，在低磁场（<1特斯拉）下检测到PL峰的磁增强，并且磁场下杂化态激子的动力学表明场诱导的态混合，解释了磁增强现象。这些发现推动了由磁场控制的可调谐单光子发射器的发展，对量子光学应用具有重要意义。
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