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

DOI: 10.1103/PhysRevB.95.081106 DOI Help

Authors: Matthew Watson (Clarendon Laboratory, Department of Physics, University of Oxford) , Steffen Backes (Goethe University, Frankfurt, Germany) , Amir Haghighirad (University of Oxford) , Moritz Hoesch (Diamond Light Source) , Timur Kim (Diamond Light Source) , Amalia Coldea (Clarendon Laboratory, Department of Physics, University of Oxford) , Roser Valentí (Goethe University, Frankfurt, Germany)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 95 , PAGES 081106(R)

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 10203 , 12153

Open Access Open Access

Abstract: We use angle-resolved photoemission 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 the 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.

Journal Keywords: ARPES, superconductivity, FeSe, I05, DMFT

Subject Areas: Physics, Materials

Instruments: I05-ARPES