论文标题
强烈无序系统中的ARPE-电子带理论融化
ARPES in strongly disordered systems -- theory of electronic bands melting
论文作者
论文摘要
众所周知，翻译对称性障碍会破坏ARPES光谱，直到它们变得无形。但是，捕获这一现象的理论框架在很大程度上已经缺少。在这里，基于对ARPES过程的严格理论，我们提供了这种急需的框架。特别是，我们展示了在这种情况下必须修改经常使用的突然电子近似值。我们的主要结果是将光发射线扩展与疾病操作员的操作员含量联系起来的论点，也将相应的订单disorder相变的关键性联系起来。为了具体，我们将重点放在沮丧的2D三角形（伪）旋转模型上，并在过渡后面具有ISING ORDISORDERSORDERSTORS。尽管如此，我们的形式主义还是一般的，可以在更广泛的背景下应用。
It is well known that translational symmetry-breaking disorder will disrupt ARPES spectra up to the point where they become invisible. However, a theoretical framework to capture this phenomenon has been largely missing. Here, based on a rigorous theory of the ARPES process, we provide this much-needed framework. In particular, we show how the frequently used sudden electron approximation has to be modified in this situation. Our main result is an argument that links the photoemission line broadening with an operator content of a disorder operator and so with the criticality of the corresponding order-disorder phase transition. For concreteness, we focus here on the frustrated 2D trigonal (pseudo-)spin model, with Ising order-disorder operators behind the transition. Still, our formalism is general and can be applied in a much broader context.
