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Employing a 10-orbital tight binding model, we present a new set of hoppingparameters fitted directly to our latest high resolution angle-resolvedphotoemission spectroscopy (ARPES) data for the high temperature tetragonalphase of FeSe. Using these parameters we predict a large 10 meV shift of thechemical potential as a function of temperature. In order to confirm this largetemperature 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 theoreticalmodels of superconductivity and of nematic order in FeSe materials.

Strongly enhanced temperature dependence of the chemical potential in FeSe