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The Nematic Energy Scale and the Missing Electron Pocket in FeSe

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arxiv 1903.04557 v2 pith:OC2HNI2E submitted 2019-03-11 cond-mat.supr-con

Ming Yi , Heike Pfau , Yan Zhang , Yu He , Han Wu , Tong Chen , Zirong Ye , Makoto Hashimoto
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Rong Yu Qimiao Si Dung-Hai Lee Pengcheng Dai Zhi-Xun Shen Donghui Lu Robert J. Birgeneau
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classification cond-mat.supr-con
keywords nematicacrosselectronicfesephasestructuretransitionelectron
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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 dxz, dyz, and dxy orbitals. The nematic energy scale between dxz and dyz bands reaches a maximum of 50 meV at the Brillouin zone corner. We are also able to track the dxz 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.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Effects of spin-orbit coupling on spin-fluctuation induced pairing in iron-based superconductors

    cond-mat.supr-con 2019-09 conditional novelty 7.0 of 10

    Spin-orbit coupling leaves the standard s+- pairing intact for typical iron pnictides, but can promote helical triplet pairing in hole-doped systems and s-wave over d-wave pairing in electron-doped systems.

  2. Raman response in the nematic phase of FeSe

    cond-mat.str-el 2019-08 conditional novelty 7.0 of 10

    In the nematic state of FeSe, B1g Raman intensity is suppressed at low frequencies because the orbital content of the Fermi pockets becomes nearly mono-orbital, and charge-conservation vertex corrections cancel the re...

  3. Orbital transmutation and the electronic spectrum of FeSe in the nematic phase

    cond-mat.supr-con 2019-08 conditional novelty 6.0 of 10

    Orbital transmutation, driven by spin-orbit coupling or surface hybridization, explains why the xz and yz states at the M point of FeSe do not merge above the nematic transition.

  4. Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors

    cond-mat.str-el 2019-08 conditional novelty 6.0 of 10

    The nematic order parameter changes sign between the Brillouin zone center and corner in both FeSe and BaFe2As2, with a common momentum dependence.

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