标题： 单层-CrTe 的电子结构$_2$：一种反铁磁二维范德瓦尔斯材料 显示英文标题

标题： Electronic structure of monolayer-CrTe$_2$: an antiferromagnetic 2D van der Waals material

摘要： 磁性范德瓦尔斯材料是实现二维（2D）材料异质结构中自旋电子功能的重要构建模块。 然而，确定它们的磁性和电子特性以及磁基态与电子结构之间的相互关系往往具有挑战性，因为只有有限的技术可以在几十到几百纳米的尺度上探测磁性和电子结构。 铬硫属化合物是一类2D磁性材料，其结构与磁性的丰富相互作用已被预测。 在这里，我们结合角分辨光电子发射和准粒子干涉成像技术来确定石墨上单层CrTe$_2$的电子结构。 通过模型计算与基于角分辨光电子能谱和扫描隧道显微镜的光谱映射比较，我们建立了磁基态和低能电子结构。 我们证明，在DFT+U框架下，当考虑Coulomb排斥$U=2.5\mathrm{eV}$时，单层CrTe$_2$的能带结构可以通过密度泛函理论（DFT）很好地捕捉到。 显示英文摘要

摘要： Magnetic van der Waals materials are an important building block to realize spintronic functionalities in heterostructures of two-dimensional (2D) materials. Yet, establishing their magnetic and electronic properties and the interrelationship between the magnetic ground state and electronic structure is often challenging because only a limited number of techniques can probe magnetism and electronic structure on length scales of tens to hundreds of nanometers. Chromium chalcogenides are a class of 2D magnetic materials for which a rich interplay between structure and magnetism has been predicted. Here, we combine angle-resolved photoemission and quasi-particle interference imaging to establish the electronic structure of a monolayer of CrTe$_2$ on graphite. From a comparison of model calculations with spectroscopic mapping using angle-resolved photoemission spectroscopy and scanning tunnelling microscopy we establish the magnetic ground state and the low energy electronic structure. We demonstrate that the band structure of monolayer CrTe$_2$ is captured well by density functional theory (DFT) in a DFT+U framework when a Coulomb repulsion of $U=2.5\mathrm{eV}$ is accounted for.