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The hallmark of nematic order in iron-based superconductors is a resistivityanisotropy but it is unclear to which extent quasiparticle dispersions,lifetimes and coherence contribute. While the lifted degeneracy of the Fe$d_{xz}$ and $d_{yz}$ dispersions has been studied extensively, only little isknown about the two other factors. Here, we combine in situ strain tuning withARPES and study the nematic response of the spectral weight in BaFe$_2$As$_2$.The symmetry analysis of the ARPES spectra demonstrates that the $d_{xz}$ bandgains quasiparticle spectral weight compared to the $d_{yz}$ band for negativeantisymmetric strain $\Delta \epsilon_{yy}$ suggesting the same response insidethe nematic phase. Our results are compatible with a different coherence of the$d_{xz}$ and $d_{yz}$ orbital within a Hund's metal picture. We also discussthe influence of orbital mixing.

Anisotropic quasiparticle coherence in nematic BaFe$_2$As$_2$ studied with strain-dependent ARPES