Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Poster I

HL 35.16: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Superconductor-topological insulator junctions based on an Sb₂Te₃/Bi₂Te₃ p-n heterostructure — •Daniel Rosenbach¹, Peter Schüffelgen¹, Martin Lanius¹, Jörn Kampmeier¹, Gregor Mussler¹, Markus Eschbach¹, Ewa Mlynczak¹, Lukasz Plucinski¹, Martina Luysberg¹, Stefan Trellenkamp¹, Martin Stehno², Prosper Ngabonziza², Alexander Brinkman², Detlev Grützmacher¹, and Thomas Schäpers¹ — ¹Peter Grünberg Institut and Jülich Aachen Research Alliance (JARA-FIT), Forschungszentrum Jülich, 52425 Jülich, Germany — ²Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands

Topological insulators combined with superconducting electrodes are very promising systems for realizing Majorana bound states. However, realizing functional structures including 3D topological insulator (TI) materials suffer from a high unintentional background doping as well as surface state degradation due to oxygen inclusion as soon as the sample is exposed to air. Here, we present the successful integration of niobium superconducting contacts on top of a 3D TI layer system. The TI layers were grown by means of molecular beam epitaxy on Si (111) substrates and are capped in-situ by a few nm of aluminumoxide to protect the Dirac-like surface states. Utilizing a layer stack of p-type doped Sb₂Te₃ on top of n-type doped Bi₂Te₃, defining a p-n heterostructure, pushes the Fermilevel at the upper surface to the Dirac-point.