Kondo screening by the surface modes of a strong topological insulator

Edmond Orignac; Sébastien Burdin

Kondo screening by the surface modes of a strong topological insulator

Edmond Orignac ¹ Sébastien Burdin ²

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon

2 LOMA - Laboratoire Ondes et Matière d'Aquitaine

Abstract : We consider a magnetic impurity deposited on the surface of a strong topological insulator and interacting with the surface modes by a Kondo exchange interaction. Taking into account the warping of the Fermi line of the surface modes, we derive a mapping to an effective one-dimensional model and show that the impurity is fully screened by the surface electrons except when the Fermi level lies exactly at the Dirac point. Using an Abrikosov fermion mean-field theory, we calculate the shape of the electronic density Friedel oscillation resulting from the presence of the Kondo screening cloud. We analyze quantitatively the observability of a sixfold symmetry in the Friedel oscillations for two prototype compounds: Bi2Se3 and Bi2Te3.

Keywords : Topological insulators surface modes Kondo screening Friedel oscillations

Document type :

Journal articles

Domain :

Physics [physics] / Condensed Matter [cond-mat] / Strongly Correlated Electrons [cond-mat.str-el]

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https://hal-ens-lyon.archives-ouvertes.fr/ensl-00842732
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