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The Key Ingredients of the Electronic Structure of FeSe
Annual Review of Condensed Matter Physics ( IF 22.6 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1146/annurev-conmatphys-033117-054137
Amalia I. Coldea 1 , Matthew D. Watson 2, 3
Affiliation  

FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics. Here, we provide an overview of the current understanding of the electronic structure of FeSe, focusing in particular on its low-energy electronic structure as determined from angle-resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements of single-crystal samples. We discuss the unique place of FeSe among iron-based superconductors, as it is a multiband system exhibiting strong orbitally dependent electronic correlations and unusually small Fermi surfaces and is prone to different electronic instabilities. We pay particular attention to the evolution of the electronic structure that accompanies the tetragonal-orthorhombic structural distortion of the lattice around 90 K, which stabilizes a unique nematic electronic state. Finally, we discuss how the multiband multiorbital nematic electronic structure impacts our understanding of the superconductivity, and show that the tunability of the nematic state with chemical and physical pressure helps to disentangle the role of different competing interactions relevant for enhancing superconductivity.

中文翻译:


FeSe电子结构的关键成分

FeSe是凝聚态物理研究前沿的一种引人入胜的超导材料。在这里,我们提供了对FeSe电子结构的当前理解的概述,特别是其低能量电子结构,该结构由角度分辨光发射光谱,量子振荡和单晶样品的磁传输测量确定。我们讨论的是FeSe在铁基超导体中的独特位置,因为它是一个多波段系统,具有很强的轨道依赖性电子相关性和非常小的费米表面,并且容易出现不同的电子不稳定性。我们特别注意伴随90 K左右晶格的四方-正交结构的电子结构的演化,稳定了独特的向列电子态。最后,我们讨论了多频带多轨道向列电子结构如何影响我们对超导性的理解,并表明向列态具有化学和物理压力的可调谐性有助于弄清不同竞争相互作用对增强超导性的作用。

更新日期:2018-03-12
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