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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: 2D Materials VII: Heterostructures (joint session O/CPP)

CPP 49.5: Talk

Thursday, March 30, 2023, 11:30–11:45, GER 37

1D Topological Superconductivity in a van der Waals heterostructure probed by Abrikosov vorticesJose Martinez-Castro1,2, •Tobias Wichmann1,3, Tomáš Samuely4, Keda Jin1,2, Oleksander Onufriienko4, F. Stefan Tautz1,3,5, Markus Ternes1,2,3, and Felix Lüpke11Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Experimentalphysik II B, RWTH Aachen, 52074 Aachen, Germany. — 3Jülich Aachen Research Alliance, Fundamentals of Future Information Technology, 52425 Jülich, Germany — 4Centre of Low Temperature Physics, Faculty of Science, P. J. Safarik University & Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia — 5Institut für Experimentalphysik IV A, RWTH Aachen, 52074 Aachen, Germany

The 2D topological insulator monolayer (ML) WTe2 is characterized by an insulating interior surrounded by helical 1D edge states. When this material is brought into proximity to the s-wave superconductor NbSe2, the spectroscopic features of the helical edge state remain intact while showing a proximity-induced superconducting gap [1]. However, so far there has been no direct evidence that the observed edge superconductivity is of different nature than that observed away from the edge. Here, by inducing Abrikosov vortices at the boundary between ML WTe2 and NbSe2, we show that the induced superconductivity in the helical edge is robust against magnetic fields, a strong indication of 1D topological superconductivity.

[1] Lüpke et al., Nat. Phys. 16, 526 (2020)

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