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arXiv 2007.10547cond-mat.mtrl-sci
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氮化硼量子发射体辐射特性的激发态计算和贝叶斯分析

Radiative properties of quantum emitters in boron nitride from excited state calculations and Bayesian analysis

Shiyuan Gao, Hsiao-Yi Chen, Marco Bernardi

摘要:

六方氮化硼(hBN)中的点缺陷作为明亮的单光子发射体引起了越来越多的关注。然而,对它们的原子结构和辐射性质的理解仍然不完全。在这里,我们研究了20多个天然缺陷和碳或氧杂质的hBN的激发态和辐射寿命使用从头计算密度泛函理论和GW加上Bethe-Salpeter方程计算,产生了大量的数据集,他们的发射能量,偏振和寿命。我们发现一个广泛的量子发射体的变化,激子能量范围从0.3至4 eV和辐射寿命从ns到ms的不同的缺陷结构。通过贝叶斯统计分析,我们确定了各种高可能性的缺陷发射器,其中本机$\mathrm{V_NN_B}$缺陷被预测具有发射能量和辐射寿命与实验一致。我们的工作推进了对hBN单光子发射体的微观理解,并引入了一个计算框架来表征和识别二维材料中的量子发射体。

英文摘要:

Point defects in hexagonal boron nitride (hBN) have attracted growing attention as bright single-photon emitters. However, understanding of their atomic structure and radiative properties remains incomplete. Here we study the excited states and radiative lifetimes of over 20 native defects and carbon or oxygen impurities in hBN using ab initio density functional theory and GW plus Bethe-Salpeter equation calculations, generating a large data set of their emission energy, polarization and lifetime. We find a wide variability across quantum emitters, with exciton energies ranging from 0.3 to 4 eV and radiative lifetimes from ns to ms for different defect structures. Through a Bayesian statistical analysis, we identify various high-likelihood defect emitters, among which the native $\mathrm{V_NN_B}$ defect is predicted to possess emission energy and radiative lifetime in agreement with experiments. Our work advances the microscopic understanding of hBN single-photon emitters and introduces a computational framework to characterize and identify quantum emitters in 2D materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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