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We report a high-resolution laser-based angle-resolved photoemissionspectroscopy (laser-ARPES) study of single crystals of FeSe, focusing on thetemperature-dependence of the hole-like bands around the ${\rm \Gamma}$ point.As the system cools through the tetragonal-orthorhombic "nematic" structuraltransition at 90~K, the splitting of the $d_{xz}$/$d_{yz}$ bands is observed toincrease by a magnitude of 13 meV. Moreover, the onset of a $\sim$10 meVdownward shift of the $d_{xy}$ band is also at 90~K. These measurements provideclarity on the nature, magnitude and temperature-dependence of the band shiftsat the ${\rm \Gamma}$ point in the nematic phase of FeSe.

Shifts and Splittings of the Hole Bands in the Nematic Phase of FeSe