自旋翻转Bethe-Salpeter方程方法研究开壳层分子基态和激发态及固体中的缺陷
Spin-flip Bethe-Salpeter equation approach for ground and excited states of open-shell molecules and defects in solids
摘要：
具有三重基态的磁性分子或缺陷等开壳层系统在电子结构方法中描述具有挑战性，但在量子信息应用中具有极大的兴趣。我们展示了一个自旋翻转的方法内的Bethe-Salpeter方程计算基态和激发态的开壳层分子和缺陷固体。该方法工作在周期性的边界条件，而不需要任何嵌入或选择的子空间。我们的基准结果的扭转势能面的乙烯和金刚石NV $^{-}$中心的光激发表现出良好的协议与文献，和低或中等水平的自旋污染。
英文摘要：
Open-shell systems such as magnetic molecules or defects with a triplet ground state are challenging to describe in electronic structure methods, but are of great interest for quantum information applications. We demonstrate a spin-flip approach within the Bethe-Salpeter equation to calculate ground and excited states of open-shell molecules and defected solids. The approach works in periodic boundary conditions without any need for embedding or selection of a subspace. Our benchmark results for the torsion potential-energy surface of ethylene and the optical excitations of the diamond NV$^{-}$ center show excellent agreement with the literature, and a low or moderate level of spin contamination.
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