Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: 2D Materials III: Growth and Heterostructures (joint session O/HL)

HL 29.8: Vortrag

Dienstag, 17. März 2020, 12:15–12:30, GER 38

Proximity-induced superconducting gap in the quantum spin Hall edge state of monolayer WTe2 — •Felix Lüpke1, Dacen Waters1, Sergio C. de la Barrera1, Michael Widom1, David G. Mandrus2,3,4, Jiaqiang Yan2, Randall M. Feenstra1, and Benjamin M. Hunt11Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA — 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA — 3Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA — 4Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA

Van der Waals (vdW) heterostructures allow the combination of different material properties, e.g. non-trivial topology and superconductivity in order to create a topological superconducting state. We demonstrate a novel dry-transfer flip technique which we use to place atomically-thin layers of WTe2, a quantum spin Hall (QSH) system, on NbSe2, a vdW superconductor, while maintaining atomically clean surfaces and interfaces. Using scanning tunneling microscopy and spectroscopy (STM/STS), we demonstrate the presence of a proximity-induced superconducting gap in the WTe2 for thicknesses from a monolayer up to 7 crystalline layers. At the edge of the WTe2 monolayer, we show that the superconducting gap coexists with the characteristic spectroscopic signature of the QSH edge state [1].

[1] F. Lüpke et al., arXiv:1903.00493 (2019)

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