Kondo screening by the surface modes of a strong topological insulator
Langue
en
Article de revue
Ce document a été publié dans
Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2013-07-15, vol. 88, n° 3, p. 035411 (1-17)
American Physical Society
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés
Isolants topologiques
états de surface
effet Kondo
oscillations de Friedel
Mots clés en anglais
Topological insulators
surface modes
Kondo screening
Friedel oscillations
Project ANR
Transport électronique dans les isolants topologiques - ANR-10-BLAN-0419
Origine
Importé de halUnités de recherche