Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: 2D Materials III: Growth and Heterostructures (joint session O/HL)
HL 29.8: Talk
Tuesday, March 17, 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. Hunt1 — 1Department 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)