The emergence of the Kondo effect in strained kagome lattices.

Kagome systems have recently received significant attention due to the discovery of kagome metals, such as alkali-based AV3Sb5 [1]. A prominent feature of the kagome lattice is the appearance of both dispersive bands with graphene-like Dirac points and van Hove singularities, as well as a flatband with highly degenerate states. This makes it an ideal system for studying topology and correlation effects. Here, we focus on the latter by analyzing the characteristics of the Kondo effect for a magnetic impurity in kagome nanoribbons under the influence of homogeneous strain. We analyze the system using the single impurity Anderson model (SIAM) and the numerical renormalization group (NRG). We find that the presence of singularities in the density of states of the nanoribbon and their strong sensitivity to applied strain allows for the enhancement and/or suppression of the Kondo effect in the impurity-plus-ribbon system. This control affects the Kondo temperature and associated features, such as the spectral function. We present results for different impurity bonding geometries and chemical potentials to assess the effect of various features on spin screening.