TY  - JOUR
A1  - Watson, Matthew D.
A1  - Backes, Steffen
A1  - Haghighirad, Amir A.
A1  - Hoesch, Moritz
A1  - Kim, Timur K.
A1  - Coldea, Amalia I.
A1  - Valentí, Roser
T1  - Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
T2  - Physical review. B : covering condensed matter and materials physics
N2  - 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.
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/82410
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-824102
SN  - 2469-9969
SN  - 2469-9950
VL  - 95
IS  - 8, 081106
PB  - American Institute of Physics
CY  - Woodbury, NY
ER  -