Kondo effect in strained kagome ribbons

Kagome systems have recently received significant attention due to the discovery of

kagome metals, such as alkali-based AV3Sb5. 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.