Kondo breakdown in multi-orbital Anderson lattices induced by destructive hybridization interference
Year: 2024
Type: article
Abstract: In this paper we consider a multi-band extension to the periodic Anderson model. We use a single site DMFT(NRG) in order to study the impact of the conduction band mediated effective hopping of the correlated electrons between the correlated orbitals onto the heavy Fermi-liquid formation. Whereas the hybridization of a single impurity model with two distinct conduction bands always adds up constructively, T_{K}\propto \exp(-\mathrm{const}\, U/(\Gamma_1+\Gamma_2)) T K ∝ exp ( − c o n s t U / ( Γ 1 + Γ 2 ) ) , we show that this does not have to be the case in lattice models, where, in remarkable contrast, also an low-energy Fermi-liquid scale T_0\propto \exp(-\mathrm{const}\, U/(\Gamma_1-\Gamma_2)) T 0 ∝ exp ( − c o n s t U / ( Γ 1 − Γ 2 ) ) can emerge due to quantum interference effects in multi-band models, where U U denotes the local Coulomb matrix element of the correlated orbitals and \Gamma_i Γ i the local hybridization strength of band i i . At high symmetry points, heavy Fermi-liquid formation is suppressed which is associated with a breakdown of the Kondo effect. This results in an asymptotically scale-invariant (i.e., power-law) spectrum of the correlated orbitals \propto|\omega|^{1/3} ∝ | ω | 1 / 3 , indicating non-Fermi liquid properties of the quantum critical point, and a small Fermi surface including only the light quasi-particles. This orbital selective Mott phase demonstrates the possibility of metallic local criticality within the general framework of ordinary single site DMFT.
Source: SciPost Physics
Authors: Fabian Eickhoff, Frithjof Anders
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Award: G3826639867
OpenAlex ID: W4402127919