Abstract
Employing a 10-orbital tight binding model, we present a new set of hopping parameters fitted directly to our latest high resolution angle-resolved photoemission spectroscopy (ARPES) data for the high temperature tetragonal phase of FeSe. Using these parameters we predict a large 10 meV shift of the chemical potential as a function of temperature. In order to confirm this large temperature dependence, we performed ARPES experiments on FeSe and observed a $\sim$25 meV rigid shift to the chemical potential between 100 K and 300 K. This unexpectedly strong shift has important implications for theoretical models of superconductivity and of nematic order in FeSe materials.
Highlights
To understand high-temperature superconductivity and nematic order in iron-based superconductors, it is necessary to obtain an accurate description and understanding of their electronic structure
Employing a 10-orbital tight-binding model, we present a set of hopping parameters fitted directly to our latest high-resolution angle-resolved photoemission spectroscopy (ARPES) data for the high-temperature tetragonal phase of FeSe
Modeling the electronic structure of iron-based superconductors has proved to be a challenging task. Ab initio calculations such as density functional theory (DFT) show some disagreement with quantum oscillation experiments [1], as well as with the band dispersions obtained from angle-resolved photoemission spectroscopy (ARPES) [2,3]
Summary
To understand high-temperature superconductivity and nematic order in iron-based superconductors, it is necessary to obtain an accurate description and understanding of their electronic structure. Modeling the electronic structure of iron-based superconductors has proved to be a challenging task. Ab initio calculations such as density functional theory (DFT) show some disagreement with quantum oscillation experiments [1], as well as with the band dispersions obtained from angle-resolved photoemission spectroscopy (ARPES) [2,3]. More sophisticated theoretical treatments such as dynamical mean-field theory (DMFT) are able to account for the orbital-dependent band renormalizations [5], yet they do not account for more specific features, such as the shrinking of the hole and electron pockets seen in even the simplest iron-based superconductor, FeSe [6]. ARPES studies on FeSe have yielded increasingly detailed information on the quasiparticle dispersions [12,13,14,15,16], despite the theoretical interest, a fully accurate model consistent with experiment is still lacking
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