Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe

  • We use angle-resolved photo-emission spectroscopy (ARPES) to explore the electronic structure of single crystals of FeSe over a wide range of binding energies and study the effects of strong electron-electron correlations. We provide evidence for the existence of "Hubbard-like bands" at high binding energies consisting of incoherent many-body excitations originating from Fe 3d states in addition to the renormalized quasiparticle bands near the Fermi level. Many high energy features of the observed ARPES data can be accounted for when incorporating effects of strong local Coulomb interactions in calculations of the spectral function via dynamical mean-field theory, including the formation of a Hubbard-like band. This shows that over the energy scale of several eV, local correlations arising from the on-site Coulomb repulsion and Hund's coupling are essential for a proper understanding of the electronic structure of FeSe and other related iron based superconductors.

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Author:Matthew D. WatsonORCiD, Steffen BackesORCiDGND, Amir A. HaghighiradORCiDGND, Moritz HoeschORCiD, Timur K. KimORCiDGND, Amalia I. ColdeaORCiD, Roser ValentíORCiDGND
URN:urn:nbn:de:hebis:30:3-824102
DOI:https://doi.org/10.1103/PhysRevB.95.081106
ISSN:2469-9969
ISSN:2469-9950
ArXiv Id:http://arxiv.org/abs/1612.02676
Parent Title (English):Physical review. B : covering condensed matter and materials physics
Publisher:American Institute of Physics
Place of publication:Woodbury, NY
Document Type:Article
Language:English
Date of Publication (online):2017/02/22
Date of first Publication:2017/02/22
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/20
Volume:95
Issue:8, 081106
Article Number:081106
Page Number:7
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International