Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 30.1: Vortrag
Dienstag, 12. März 2013, 09:30–09:45, H21
Kondo effect on the surface of 3D topological insulators: Signatures in scanning tunneling spectroscopy — •Lars Fritz1, Andrew Mitchell1,2, Dirk Schuricht3, and Matthias Vojta4 — 1Universität zu Köln, Institut für Theoretische Physik — 2Department of Chemistry, Physical and Theoretical Chemistry, Oxford University, UK — 3Institute for Theory of Statistical Physics and JARA-Fundamentals of Future Information Technology, RWTH Aachen University — 4nstitut für Theoretische Physik, Technische Universität Dresden
We investigate the scattering off dilute magnetic impurities placed on the surface of three- dimensional topological insulators. In the low-temperature limit, the impurity moments are Kondo- screened by the surface-state electrons, despite their exotic locking of spin and momentum. We determine signatures of the Kondo effect appearing in quasiparticle interference (QPI) patterns as recorded by scanning tunneling spectroscopy, taking into account the full energy dependence of the T matrix as well as the hexagonal warping of the surface Dirac cones. We identify a universal energy dependence of the QPI signal at low scanning energies as fingerprint of Kondo physics, markedly different from the signal due to non-magnetic or static magnetic impurities. Finally, we discuss our results in the context of recent experimental data.