Bands, resonances, edge singularities and excitons in core level spectroscopy investigated within the dynamical mean-field theory
Bands, resonances, edge singularities and excitons in core level spectroscopy investigated within the dynamical mean-field theory
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DOI：
10.1209/0295-5075/108/57004
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发表时间：
2014-12-01
期刊：
影响因子：
1.8
通讯作者：
Macke, S.
中科院分区：
文献类型：
--
作者：
Haverkort, M. W.;Sangiovanni, G.;Macke, S.
利用最近开发的杂质求解器，我们举例说明了动态平均场理论如何在金属、相关金属和莫特绝缘体的核心能级x射线吸收光谱（XAS）和核心能级光电子能谱（cPES）中捕获带激发、共振、边缘奇点和激子。比较不同核价相互作用值下的XAS，可以看出在没有核价相互作用的情况下，准粒子峰是如何演变成形状相似但起源不同的共振的。鉴于XAS对金属绝缘体跃迁相当不敏感，由于非局部筛选，可以使用cPES来测量局部电荷波动的量。中国人民解放军版权所有
Using a recently developed impurity solver we exemplify how dynamical mean-field theory captures band excitations, resonances, edge singularities and excitons in core level x-ray absorption spectroscopy (XAS) and core level photo electron spectroscopy (cPES) on metals, correlated metals and Mott insulators. Comparing XAS at different values of the core-valence interaction shows how the quasiparticle peak in the absence of core-valence interactions evolves into a resonance of similar shape, but different origin. Whereas XAS is rather insensitive to the metal insulator transition, cPES can be used, due to nonlocal screening, to measure the amount of local charge fluctuation. Copyright (C) EPLA, 2014