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TT: Fachverband Tiefe Temperaturen

TT 84: 2D Materials: Electronic structure, excitations, etc. III (joint session O/HL/TT)

TT 84.9: Vortrag

Donnerstag, 12. März 2026, 17:00–17:15, HSZ/0204

Unconventional Topological Superconductivity in CrCl3/NbSe2 heterostructures — •Souvik Das¹, Benjamin Zhou^2,3, Anshuman Padhi¹, Jing-Rong Ji¹, Niclas Heinsdorf^2,3, Prajwal Rigvedi¹, Tianzhe Chen¹, Weibin Li⁴, Pierluigi Gargiani⁴, Manuel Valvidares⁴, Marcel Franz^2,3, Banabir Pal¹, and Stuart S.P. Parkin¹ — ¹Max Planck Institute of Microstructure Physics, Halle, Germany — ²Quantum Matter Institute, University of British Columbia, Vancouver, Canada — ³Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada — ⁴ALBA Synchrotron Light Source, Barcelona, Spain

Topological p-wave superconductors can host non-Abelian particles useful for fault-tolerant quantum computing. Here we report experimental evidence of unconventional topological superconductivity in a heterostructure of monolayer, in-plane ferromagnetic CrCl3 islands on superconducting NbSe2. STM measurements show that, despite CrCl3 being ferromagnetic, the interfacial superconducting gap is more robust against out-of-plane magnetic fields than the s-wave gap of NbSe2, indicating unconventional pairing. We also find enhanced zero-energy states along CrCl3 island edges, consistent with the presence of edge modes. Theory suggests these features arise from an intrinsic helical p-wave state stabilized by interfacial Rashba spin-orbit coupling. This demonstrates a new route to create topological superconductivity via interface engineering.

Keywords: Scanning Tunneling Microscopy and Spectroscopy; Topological Superconductivity; Ferromagnetism; edge modes; Rashba spin-orbit coupling