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TT: Fachverband Tiefe Temperaturen

TT 98: Focus Session: Visualization of Heavy Fermion Formation through Scanning Tunneling Microscopy

TT 98.7: Vortrag

Donnerstag, 19. März 2015, 18:00–18:15, H 0104

Scanning tunneling spectroscopy and surface quasiparticle interference in models for the topological Kondo insulator SmB₆ — •Pier Paolo Baruselli and Matthias Vojta — Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

SmB₆ is one of the candidate compounds for topological Kondo insulators, a class of materials which combines a non-trivial topological band structure with strong electronic correlations. We present a theoretical study [1] of the surface-state signatures induced by dilute impurities in scanning tunneling spectroscopy and quasiparticle interference. We employ a multiband tight-binding description, supplemented by a slave-particle approach to account for strong interactions. We discuss the spin structure of the three surface Dirac cones and provide concrete predictions for the energy and momentum dependence of the resulting QPI signal. Moreover, we analyse the effect of a 2x1 surface reconstruction on such signals.

[1] P. P. Baruselli and M. Vojta, PRB 90, 201106(R) (2014)