论文标题
有限温度下光发射的一步模型：Fe的自旋波动（001）
One step model of photo-emission at finite temperatures: spin fluctuations of Fe(001)
论文作者
论文摘要
在过去的二十年中，各种技术发展扩大了角度分辨光发射（ARPE）的潜力。特别是改善了动量，能量和自旋分辨率，以及从几个EV到几个KEV的光子能量的使用使ARPES成为研究固体和表面的电子特性的相当独特的工具。通过我们的工作，我们提出了光发射过程的最先进的描述状态，即所谓的一步模型，描述了激发，传输到表面并以连贯的方式逃入真空中。特别是，我们介绍了依赖温度的ARPE的理论描述，并特别强调自旋波动。有限温度效应包括基于相干电位近似的所谓合金类比模型，这种方式允许在相同准确性上定量地描述不相关的晶格振动与自旋波动相结合。为了证明我们方法的适用性，相应的数值分析已应用于有限温度下Fe（100）的自旋和角度分辨光发射。
Various technical developments extended the potential of angle-resolved photoemission (ARPES) tremendously during the last twenty years. In particular improved momentum, energy and spin resolution as well as the use of photon energies from few eV up to several keV makes ARPES a rather unique tool to investigate the electronic properties of solids and surfaces. With our work we present a generalization of the state of the art description of the photoemission process, the so called one-step model that describes excitation, transport to the surface and escape into the vacuum in a coherent way. In particular, we present a theoretical description of temperature-dependent ARPES with a special emphasis on spin fluctuations. Finite temperature effects are included within the so called alloy analogy model which is based on the coherent potential approximation and this way allows to describe uncorrelated lattice vibrations in combination with spin fluctuations quantitatively on the same level of accuracy. To demonstrate the applicability of our approach a corresponding numerical analysis has been applied to spin- and angle-resolved photoemission of Fe(100) at finite temperatures.
