Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe

Abstract

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.

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Cited by in corpus (16)

• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• A Rigorous Formalism of Unconventional Symmetry Breaking in Fermi Liquid Theory and Its Application to Nematicity in FeSe
• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
• FeSe and the missing electron pocket problem
• Pure nematic state in iron-based superconductor
• Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S)
• Multipolar nematic state of nonmagnetic FeSe based on the DFT+$U$
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements
• Probing the topological character of superconductors via non-local Hanbury-Brown and Twiss correlations
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe
• Symmetry-breaking-induced topology in FeSe
• Specific Heat and the gap structure of a Nematic Superconductor, application to FeSe