Superconductivity emerges in proximity to a nematic phase in most iron-based superconductors. It is therefore important to understand the impact of nematicity on the electronic structure. Orbital assignment and tracking across the nematic phase transition prove to be challenging due to the multiband nature of iron-based superconductors and twinning effects. Here, we report a detailed study of the electronic structure of fully detwinned FeSe across the nematic phase transition using angle-resolved photoemission spectroscopy. We clearly observe a nematicity-driven band reconstruction involving d x z , d y z , and d x y orbitals. The nematic energy scale between d x z and d y z bands reaches a maximum of 50?meV at the Brillouin zone corner. We are also able to track the d x z electron pocket across the nematic transition and explain its absence in the nematic state. Our comprehensive data of the electronic structure provide an accurate basis for theoretical models of the superconducting pairing in FeSe.
展开▼
机译：超导率在大多数铁基超导体中邻近到向列相。因此，了解对网格性对电子结构的影响很重要。由于铁基超导体和孪晶效应的多频带性质，轨道分配和跟踪横跨向列语转移证明是挑战性的。在这里，我们通过角度分辨的光学激发光谱报告了通过角度分辨的光学激发光谱分析跨越向内转变的完全扭转FESE的电子结构的详细研究。我们清楚地观察到涉及D X Z，D Y Z和D X Y轨道的向内驱动的带重建。 D X Z和D Y Z频段之间的向方能量级达到布里渊区角落最多50？MEV。我们还能够追踪D X Z电子口袋，向上过渡并解释其在向列中的缺失。我们的电子结构的综合数据为FESE中超导配对的理论模型提供了准确的基础。
展开▼
