How does momentum-dependent hybridization influence the incorporation of localized f-electron degrees of freedom into the low lying electronic structure of heavy fermion systems?

How the localized f-electron degrees of freedom incorporate into the Fermi surface is an open question in heavy fermion (HF) physics.

To address this, we examine the archetypal mixed valent material CePd₃, whose large Kondo temperature makes it amenable to spectroscopic and theoretical investigation. Prior work has shown good agreement between density functional theory + dynamical mean field theory (DFT+DMFT) calculations and inelastic neutron scattering as well as RIXS measurements, suggesting a local (or momentum-independent) renormalized self-energy [1]. Here we examine the comparison of the single particle spectral function calculated by our DFT+DMFT with our high-resolution angle-resolved photoemission spectroscopy (ARPES). Through this holistic approach we have unambiguously determined the role momentum-dependent hybridization plays on the incorporation of the localized degrees of freedom into the low-lying electronic structure for CePd₃.

[1] Rahn, M.C., Kummer, K., Hariki, A. et al. Nat Commun 13, 6129 (2022)