Kondo screening by the surface modes of a strong topological insulator

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.
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Edmond Orignac, Sébastien Burdin. Kondo screening by the surface modes of a strong topological insulator. Physical Review B : Condensed matter and materials physics, American Physical Society, 2013, 88 (3), pp.035411 (1-17). ⟨10.1103/PhysRevB.88.035411⟩. ⟨ensl-00842732⟩



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