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Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: Topological Insulators II (joint session TT/MA)

MA 44.1: Vortrag

Donnerstag, 15. März 2018, 09:30–09:45, A 053

Robust spin-polarized midgap states at step edges of topological crystalline insulators — •Domenico Di Sante1, Paolo Sessi2, Martin Greiter1, Titus Neupert3, Giorgio Sangiovanni1, Tomasz Story4, Ronny Thomale1, and Matthias Bode21Institut fuer Theoretische Physik, Universitaet Wuerzburg — 2Experimentelle Physik II, Universitaet Wuerzburg — 3Physik Institut, Universitaet Zuerich, Switzerland — 4Institute of Physics, Polish Academy of Sciences, Warsaw, Poland

Topological crystalline insulators are materials in which the crystalline symmetry leads to topologically protected surface states with a chiral spin texture, rendering them potential candidates for spintronics applications. In this talk, I report on the discovery of one dimensional midgap states at odd atomic surface step edges of the three dimensional topological crystalline insulator (Pb,Sn)Se. A minimal toy model and realistic tight-binding calculations identify them as spin polarized flat bands connecting two Dirac points. The midgap states inherit stability through the two dimensional Dirac metal from the three dimensional bulk insulator. This makes (Pb,Sn)Se the first example for a crystal symmetry protected hierarchy of one and two dimensional topological modes, which we experimentally prove to result in a striking robustness to defects, strong magnetic fields, and elevated temperature.
P.Sessi, D. Di Sante et. al, Science 354 1269 (2016)

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