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内容記述 |
Group-IV vacancy centers in diamond is one of the leading candidates for the solid-state spin qubit due to their excellent optical and spin properties. Because the charge states determine the electronic structure, only specific configurations exhibit magneto-optical activity. Thus, the control over the charge state is fundamental for quantum applications. In this study, we report the first observation of a high-efficiency charge cycling of the lead-vacancy centers (PbV) using an optical method based on non-resonant laser irradiation. Under blue light irradiation, a negatively charged PbV center transitions to a dark state, with a population up to 99.9%. This behavior under blue laser irradiation is entirely distinct from other group-IV centers (SiV, GeV, SnV), where the negatively charged state is stabilized. Subsequent green laser irradiation repumps the PbV center into the negatively charged state with a population up to 89%. This multi-color laser irradiation method enables the tunable manipulation over the charge state of the PbV centers. In addition, the analysis of charge dynamics suggests that the dark state created by blue laser irradiation is neutral state. Our results determine the condition for the stable presence of the negatively charged PbV and quantify its population, providing a foundation for future studies of its spin properties. Furthermore, our work also indicates a potential optical pathway to access the neutral PbV centers, opening new opportunities for its exploration. |
