标题： 单层CrSBr在Au上的两个导带 显示英文标题

标题： The two conduction bands of monolayer CrSBr on Au

摘要： 我们报告了单层CrSBr在云母模板剥离金基底上的电子结构。角度分辨光电子能谱揭示了从基底的电荷转移，填充了单层CrSBr的导带，并伴随着准粒子带隙的显著减小。此外，我们观察到两个独立的导带，在X点表现出分裂。这表明滑移镜对称性的破坏，而在体材料或自由悬浮的单层中，该对称性保护布里渊区边界处的能带简并。我们的结果表明，超平坦金基底的作用不仅仅是改变载流子密度和屏蔽效应：它们可以打破对称性保护的简并，从而根本性地重塑二维材料的能带拓扑。 显示英文摘要

摘要： We report the electronic structure of monolayer CrSBr exfoliated onto mica template-stripped gold substrates. Angle-resolved photoemission spectroscopy reveals charge transfer from the substrate, populating the conduction band of monolayer CrSBr, accompanied by a pronounced reduction in the quasiparticle band gap. Furthermore, we observe two separate conduction bands that exhibit a splitting at the X point. This indicates a breaking of glide-mirror symmetry, which in the bulk or in a free-standing monolayer protects the band degeneracies at the Brillouin zone boundary. Our results demonstrate that ultraflat gold substrates do more than modify carrier densities and screening: they can lift symmetry-protected degeneracies and thus fundamentally reshape the band topology of 2D materials.