Evolution of topological end states in the one-dimensional Kondo-Heisenberg model with site modulation

TL;DR

This paper explores how topological end states influence the Kondo effect in a one-dimensional Kondo-Heisenberg model, revealing a critical coupling where edge states disrupt Kondo screening, and maps the phase transition.

Contribution

It introduces a phase diagram showing the transition of topological end states affecting the Kondo effect in a 1D model with site modulation.

Findings

Kondo effect can be destroyed at edges by topological end states

A finite critical Kondo coupling $J_{K}^{c}$ exists for the transition

Phase diagram characterizes the end state transition

Abstract

We investigate the interplay of the topological and Kondo effects in a one-dimensional Kondo-Heisenberg model with nontrivial conduction band using the density matrix renormalization group method. By analyzing the density profile, the local hybridization, and the spin/charge gap, we find that the Kondo effect can be destructed at the edges of the chain by the topological end state below a finite critical Kondo coupling $J_{K}^{c}$. We construct a phase diagram characterizing the transition of the end states.