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arXiv 2104.04256cond-mat.mes-hallquant-ph
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金刚石中NV+的明亮$\mathrm{\textit{ab-initio}}$光致发光

Bright $\mathrm{\textit{ab-initio}}$ photoluminescence of NV+ in diamond

Akib Karim, Igor Lyskov, Salvy P. Russo, Alberto Peruzzo

摘要:

金刚石中带正电荷的氮空位(NV+)中心由于实验上缺乏光学特征,传统上被视为暗态。最近的计算研究表明,它是可能的NV+缺陷有一个激发态过渡相当于带负电荷的(NV-)中心,但没有PL预测已报告到目前为止。我们报告的第一个$\mathrm{\textit{ab-initio}}$计算表明,NV+中心呈现量子发射,在765 nm处具有零声子线和非零跃迁偶极矩,约为NV-的跃迁偶极矩的4倍。我们根据含时密度泛函理论(单重态和三重态E态)计算了多电子态的能级,并使用我们最近开发的频率截止方法,我们预测了完整的PL谱。我们的研究结果表明,这种状态不能被认为是本质上的“黑暗”和电荷特定的猝灭机制应作为缺乏光学活性的实验表征的原因进行调查。

英文摘要:

The positively charged nitrogen vacancy (NV+) centre in diamond has been traditionally treated as a dark state due to the experimental lack of an optical signature. Recent computational studies have shown that it is possible for the NV+ defect to have an excited state transition equivalent to that of the negatively charged (NV-) centre, but no PL predictions have been reported so far. We report the first $\mathrm{\textit{ab-initio}}$ calculation showing that the NV+ center presents quantum emission, with zero phonon line at 765 nm and a non-zero transition dipole moment, approximately 4x smaller than the transition dipole moment of NV-. We calculate the energy levels of the multielectron states under time-dependent density functional theory (singlet and triplet E states), and using our recently developed frequency cutoff method, we predict the full PL spectrum. Our results suggest that this state cannot be considered intrinsically 'dark' and charge specific quenching mechanisms should be investigated as the cause of the lack of optical activity in experimental characterizations.

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