论文标题
对X射线吸收光谱的高温自我能量校正
High-temperature self-energy corrections to x-ray absorption spectra
论文作者
论文摘要
在有限温度的准粒子局部密度GW近似中，研究了有限温度的准粒子自能校正对X射线吸收光谱的影响。为了促进计算，我们使用低阶多项式拟合来参数化准粒子自我能源。我们表明，以$ t $的增加，电子寿命的温度驱动降低显着拓宽了近边缘区域的光谱。然而，在等离子体激发发作附近，准粒子移位最为强烈。
Effects of finite-temperature quasiparticle self-energy corrections to x-ray absorption spectra are investigated within the finite-temperature quasiparticle local density GW approximation up to temperatures $T$ of order the Fermi temperature. To facilitate the calculations, we parametrize the quasiparticle self-energy using low-order polynomial fits. We show that temperature-driven decrease in the electron lifetime substantially broadens the spectra in the near-edge region with increasing $T$. However, the quasiparticle shift is most strongly modified near the onset of plasmon excitations.
