arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.16459cond-mat.mtrl-sciphysics.chem-ph
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六方氮化硼中$V_N N_B$缺陷的纳米光子学应用

Possible nanophotonics applications of the $V_N N_B$ defect in hexagonal boron nitride

A. Sajid, Jeffrey R. Reimers, Rika Kobayashi, Michael J. Ford

摘要:

六方氮化硼(h-BN)中的$V_N N_B$缺陷,包括邻近氮对硼取代的氮空位,就其在纳米光子器件中的可能有用性进行建模。建模是在一个简单的模型化合物和缺陷的2D周期性表示上进行的,考虑到其磁性和光谱特性。在$V_N N_B$激发态的电子分布是非常开壳层的性质,并处理这两个新的计算方法的开发:一个允许标准的密度泛函理论(DFT)的计算被用来评估状态能量,其他介绍所需的技术应用VASP计算包,这些和许多其他问题,涉及激发态。同样的一般用途,DFT计算的结果,然后校准对从头算方法,寻求强大的计算方案。这些创新允许考虑中性、+1和-1带电形式的缺陷的45种电子状态。带电形式的缺陷预测显示纳米光子学的潜在利益的属性。

英文摘要:

The $V_N N_B$ defect in hexagonal boron nitride (h-BN), comprising a nitrogen vacancy adjacent to a nitrogen-for-boron substitution, is modelled in regard to its possible usefulness in a nanophotonics device. The modelling is done on both a simple model compound and on a 2D periodic representation of the defect, considering its magnetic and spectroscopic properties. The electronic distribution in $V_N N_B$ excited states is very open-shell in nature, and to deal with this two new computational methods are developed: one allows standard density-functional theory (DFT) calculations to be employed to evaluate state energies, the other introduces techniques needed to apply the VASP computational package to these and many other problems involving excited states. Also of general use, results from DFT calculations are then calibrated against those from ab initio methods, seeking robust computational schemes. These innovations allow 45 electronic states of the defect in its neutral, +1 and -1 charged forms to be considered. The charged forms of the defect are predicted to display properties of potential interest to nanophotonics.

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