Recent x-ray absorption experiments have demonstrated the possibility to accurately monitor the magnetism of metallic heterostructures controlled via a time-independent perturbation caused, for example, by a static electric field. Using a first-principles, nonequilibrium Green's function scheme, we show how the measured dichroic signal for the corresponding steady-state situation can be related to the underlying electronic structure and its response to the external stimulus. The suggested approach works from the infinitesimal limit of linear response to the regime of strong electric field effects, which is realized in present experimental high-sensitivity investigations.

中文翻译：

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稳态压控磁性的第一性原理计算：在X射线吸收光谱实验中的应用

最近的X射线吸收实验表明，有可能精确监视金属异质结构的磁性，该金属异质结构是通过与时间无关的扰动控制的，例如由静电场引起的扰动。使用第一原理非平衡格林函数方案，我们展示了相应稳态情况下测得的二向色信号如何与基础电子结构及其对外部刺激的响应相关。所建议的方法从线性响应的无穷小极限到强电场效应机制的工作，这在当前的实验高灵敏度研究中已经实现。