论文标题
拓扑相变材料中阻塞的绝缘体和平坦带
Obstructed insulators and flat bands in topological phase-change materials
论文作者
论文摘要
相变材料在技术上无处不在，因为它们的能力在光线或通过电流时快速而可逆地之间的无定形和晶体相之间过渡。在这里，我们认为，要充分了解它们的电子特性，有必要定义一个新型的电子相：无定形的阻塞绝缘子。它与阻塞的绝缘体晶体不同，因为它呈现局部边缘或表面状态，而与样品终止无关。因此，我们表明，在三维中阻塞的无定形绝缘子具有可使用ARPE检测的表面二维平坦带。我们的工作为材料建立了基本模型，在这些材料中，拓扑和阻塞性能可以在外部打开和关闭，包括二维表面平带。
Phase-change materials are ubiquitous in technology because of their ability to transition between amorphous and crystalline phases fast and reversibly, upon shining light or passing a current. Here we argue that to fully understand their electronic properties it is necessary to define a novel electronic phase: the amorphous obstructed insulator. It differs from an obstructed insulator crystal in that it presents localized edge or surface states irrespective of the sample termination. Consequently, we show that obstructed amorphous insulators in three-dimensions host a surface two-dimensional flat band, detectable using ARPES. Our work establishes basic models for materials where topological and obstructed properties can be switched on and off externally, including two-dimensional surface flatbands.
