Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 70: Topological Insulators I (joined session with TT)

HL 70.1: Invited Talk

Thursday, March 23, 2017, 09:30–10:00, POT 251

Sub-nm probing of Topological insulators and Rashba systems — •Markus Morgenstern — II. Institute of Physics and JARA-FIT, RWTH Aachen, D-52074 Aachen, Germany

Spin-orbit interactions in solids are the key for many anticipated new functionalities ranging from the meanwhile traditional Datta-Das transistor to topological quantum computation using Majorana excitations. Local probes can provide crucial information on this interaction down to the nm scale. Within this talk, I will show how scanning tunneling spectroscopy reveals the presence of topologically protected edge states provided by a spin-orbit induced band inversion of heavy metal graphene [1], how the detrimental fluctuations of the spin-orbit interaction can be probed down to the nm length scale [2], and that ferroelectricity induces Rashba-type spin-orbit interaction within the bulk of the simple binary material GeTe [3].

[1] C. Pauly et al., Nat. Phys. 11, 338 (2015); ACS Nano 10, 3995 (2016). [2] J. R. Bindel et al., Nat. Phys. 12, 920 (2016). [3] M. Liebmann et al., Adv. Mat. 20, 560 (2016); H. J. Elmers et al., Phys. Rev. B 94, 201403 (2016).