论文标题
非本地$ d_ {xy} $ nematicity和fese中缺少的电子口袋
Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
论文作者
论文摘要
自发电子列有序的起源为了解基于铁的超导体提供了重要信息。在这里，我们分析了一个场景，其中$ d_ {xy} $轨道强烈促进了FESE的列表订购。我们表明，将$ d_ {xy} $ nematicity添加到纯$ d_ {xz}/d_ {yz} $ order上，为异常的费米表面提供了自然的解释，并正确地重现了超支差距的强烈的各向异性动量依赖性。我们预测了由温度和硫掺杂介导的电子口袋的LIFSHITZ过渡，我们通过分析可用的实验数据来讨论其签名。我们介绍了在抑制nematicity时超导间隙的动量依赖性的变化。我们的定量准确模型产生了从四方到列的过渡，以及FESE $ _ {1-x} $ s $ _ {x} $系列，并对可能的列表机制施加了强大的约束。
The origin of spontaneous electronic nematic ordering provides important information for understanding iron-based superconductors. Here, we analyze a scenario where the $d_{xy}$ orbital strongly contributes to nematic ordering in FeSe. We show that the addition of $d_{xy}$ nematicity to a pure $d_{xz}/d_{yz}$ order provides a natural explanation for the unusual Fermi surface and correctly reproduces the strongly anisotropic momentum dependence of the superconducting gap. We predict a Lifshitz transition of an electron pocket mediated by temperature and sulphur doping, whose signatures we discuss by analysing available experimental data. We present the variation of momentum dependence of the superconducting gap upon suppression of nematicity. Our quantitatively accurate model yields the transition from tetragonal to nematic FeSe and the FeSe$_{1-x}$S$_{x}$ series, and puts strong constraints on possible nematic mechanisms.
