Nematic Energy Scale and the Missing Electron Pocket in FeSe
Nematic Energy Scale and the Missing Electron Pocket in FeSe
复制标题
向列相能量尺度和 FeSe 中缺失的电子袋
DOI：
10.1103/physrevx.9.041049
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发表时间：
2019-12-06
影响因子：
12.5
通讯作者：
Birgeneau, R. J.
中科院分区：
文献类型：
--
作者：
Yi, M.;Pfau, H.;Birgeneau, R. J.
在大多数铁基超导体中，超导性出现在向列相附近。因此，了解向列性对电子结构的影响是很重要的。由于铁基超导体和孪晶效应的多波段性质，向列相转变的轨道分配和跟踪被证明是具有挑战性的。在这里，我们报告了一个详细的研究完全确定的FeSe的电子结构跨越向列相转变的角度分辨光谱学。我们清楚地观察到d(xz), d（yz）和d（xy）轨道的向列驱动带重构。d（xz）和d（yz）波段之间的向列能量尺度在布里渊区角处最大达到50 meV。我们还能够在向列跃迁中跟踪d（xz）电子口袋，并解释它在向列态中的缺失。我们全面的电子结构数据为FeSe中超导配对的理论模型提供了准确的基础。
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(xz), d(yz), and d(xy) orbitals. The nematic energy scale between d(xz) and d(yz) bands reaches a maximum of 50 meV at the Brillouin zone corner. We are also able to track the d(xz) 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.