SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 74: 2D Materials IV: Heterostructures (joint session O/CPP)

O 74.5: Vortrag

Donnerstag, 30. März 2023, 11:30–11:45, GER 37

1D Topological Superconductivity in a van der Waals heterostructure probed by Abrikosov vortices — Jose Martinez-Castro^1,2, •Tobias Wichmann^1,3, Tomáš Samuely⁴, Keda Jin^1,2, Oleksander Onufriienko⁴, F. Stefan Tautz^1,3,5, Markus Ternes^1,2,3, and Felix Lüpke¹ — ¹Peter 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)