For more than 20 years, quantum criticality in heavy-fermion (HF) systems has remained a subject of ongoing experimental and theoretical research. In this paper, we study several open theoretical questions within a canonical model for HF systems, the periodic Anderson model (PAM) in three dimensions. Our new insights are derived from real-frequency results with unprecedented energy resolution at arbitrarily low temperatures, obtained using cellular dynamical mean-field theory with the numerical renormalization group (NRG) impurity solver. We identify the nature of the Kondo breakdown quantum critical point and the non-Fermi liquid in the quantum critical regime. We also resolve the paradox of the Fermi surface reconstruction.

 

URL: https://journals.aps.org/prx/abstract/10.1103/PhysRevX.14.041036