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We investigate the scattering off dilute magnetic impurities placed on thesurface of three-dimensional topological insulators. In the low-temperaturelimit, the impurity moments are Kondo-screened by the surface-state electrons,despite their exotic locking of spin and momentum. We determine signatures ofthe Kondo effect appearing in quasiparticle interference (QPI) patterns asrecorded by scanning tunneling spectroscopy, taking into account the fullenergy dependence of the T matrix as well as the hexagonal warping of thesurface Dirac cones. We identify a universal energy dependence of the QPIsignal at low scanning energies as the fingerprint of Kondo physics, markedlydifferent from the signal due to non-magnetic or static magnetic impurities.Finally, we discuss our results in the context of recent experimental data.

Kondo effect on the surface of 3D topological insulators: Signatures in scanning tunneling spectroscopy