Kondo screening by the surface modes of a strong topological insulator
Language
en
Article de revue
This item was published in
Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2013-07-15, vol. 88, n° 3, p. 035411 (1-17)
American Physical Society
English 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 ...Read more >
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.Read less <
Keywords
Isolants topologiques
états de surface
effet Kondo
oscillations de Friedel
English Keywords
Topological insulators
surface modes
Kondo screening
Friedel oscillations
ANR Project
Transport électronique dans les isolants topologiques - ANR-10-BLAN-0419
Origin
Hal imported