An Anderson impurity interacting with the helical edge states in a quantum spin Hall insulator

Abstract

Using the natural orbitals renormalization group (NORG) method, we have investigated the screening of the local spin of an Anderson impurity interacting with the helical edge states in a quantum spin Hall insulator. We find that there is a local spin formed at the impurity site and the local spin is completely screened by electrons in the quantum spin Hall insulator. Meanwhile, the local spin is screened dominantly by a single active natural orbital. We then show that the Kondo screening mechanism becomes transparent and simple in the framework of natural orbitals formalism. We project the active natural orbital respectively into real space and momentum space to characterize its structure. And we confirm the spin-momentum locking property of the edge states based on the occupancy of a Bloch state in the edge to which the impurity couples. Furthermore, we study the dynamical property of the active natural orbital represented by the local density of states, from which we observe the Kondo resonance peak.

arXiv comment5 pages, 6 figures

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Cited by in corpus (7)

• Emergent Kondo behavior from gauge fluctuations in spin liquids
• Natural orbitals renormalization group approach to a Kondo singlet
• Order parameter for the multichannel Kondo model at quantum criticality
• Programmable Kondo Effect Formed by Landau Levels
• Low-energy interband Kondo bound states in orbital-selective Mott phases
• Natural orbitals renormalization group approach to a spin-1/2 impurity interacting with two helical liquids
• Magnetic correlation between two local spins in a quantum spin Hall insulator