The Nematic Energy Scale and the Missing Electron Pocket in FeSe

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...

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Published inarXiv.org
Main Authors Yi, Ming, Pfau, Heike, Zhang, Yan, He, Yu, Wu, Han, Chen, Tong, Ye, Zirong, Hashimoto, Makoto, Yu, Rong, Si, Qimiao, Lee, Dung-Hai, Dai, Pengcheng, Shen, Zhi-Xun, Lu, Donghui, Birgeneau, Robert J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 07.12.2019
Subjects
Brillouin zones
Correlation analysis
Electrons
Phase transitions
Photoelectric emission
Physics - Superconductivity
Reconstruction
Single crystals
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.04557