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arXiv 2201.07541cond-mat.mtrl-scicond-mat.other
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CleaRIXS:一种快速精确的共振非弹性X射线散射的第一性原理方法

CleaRIXS: A Fast and Accurate First-Principles Method for Simulation and Analysis of Resonant Inelastic X-ray Scattering

Subhayan Roychoudhury, David Prendergast

摘要:

共振非弹性X射线散射(RIXS)是一种以相互关联的方式探测被占据和未被占据的电子子空间的实验技术,它是物理、化学和材料科学研究电子结构中最详细、最复杂、信息最丰富的实验技术之一。我们介绍了一个从头算,准确和有效的计算框架模拟和分析RIXS光谱,它结合了两个不同的和建立的方法来建模电子激发态。芯-空穴线性响应RIXS(CleaRIXS)方法不仅确保电子与芯和价空穴的相互作用的准确结合,而且还将突出的RIXS特征自动映射到相关的电子激发和去激发。通过与之前的甲醇C K边RIXS测量[J. Phys. Chem. A 120,2260(2016)]的直接比较,我们显示了形式主义在模拟RIXS光谱的不同区域和获得有关其起源的物理见解方面的有效性。除了CleaRIXS和用于模拟X射线吸收和非共振X射线发射的基于行列式的方法之间的联系之外,还探讨了包括价电子-空穴相互作用的重要性。另外RIXS功能所产生的可能的振动介导的过程的定性讨论。CleaRIXS为RIXS过程的预测和解释以及复杂电子激发态的模拟提供了一个强大且可扩展的框架。

英文摘要:

Resonant Inelastic X-ray Scattering (RIXS), which probes the occupied and unoccupied electronic subspaces in an interrelated fashion, is one of the most detailed, complex and information-rich experimental techniques employed in the investigation of electronic structure across physics, chemistry and materials science. We introduce an ab-initio, accurate and efficient computational framework for simulation and analysis of RIXS spectra, which combines two diverse and established approaches to modeling electronic excited states. The Core-Hole Linear-Response RIXS (CleaRIXS) method not only ensures accurate incorporation of the interaction of electrons with core and valence holes, but also automatically maps the salient RIXS features to the relevant electronic excitations and de-excitations. Through direct comparison with previous methanol C K-edge RIXS measurements [J. Phys. Chem. A 120, 2260 (2016)], we show the efficacy of the formalism in modeling different regions of the RIXS spectrum and in gaining physical insight regarding their origins. The importance of including the valence electron-hole interactions is explored, in addition to the connection between CleaRIXS and determinant-based approaches for simulating X-ray absorption and non-resonant X-ray emission. A qualitative discussion of additional RIXS features arising from possible vibrationally-mediated processes is also presented. CleaRIXS provides a robust and extendable framework for prediction and interpretation of RIXS processes and for the simulation of complex electronic excited states in general.

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