Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 84: Electronic Structure of Surfaces I: Spectroscopy, Surface States
O 84.9: Talk
Thursday, March 21, 2024, 12:30–12:45, MA 144
Observation of Chiral Surface State in Superconductor NbGe — •Mengyu Yao1, Martin Gutierrez-Amigo2,3, Subhajit Roychowdhury1, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Departamento de Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080 Bilbao, Spain — 3Centro de Física de Materiales (CSIC-UPV/EHU), Manuel de Lardizabal pasealekua 5, 20018 Donostia/San Sebastián, Spain
The interplay between topology and superconductivity in quantum materials harbors rich physics ripe for discovery. In this work, we investigate the topological properties and superconductivity in the nonsymmorphic chiral superconductor NbGe2 using high-resolution angle-resolved photoemis- sion spectroscopy (ARPES), transport measurements, and ab initio calculations. Our ARPES data reveals exotic chiral surface states on the (100) surface, stemming from the inherent chiral crystal structure. Supporting calculations indicate NbGe2 likely hosts elusive Weyl fermions in the bulk electronic structure. Furthermore, we uncover signatures of van Hove singularities that could engen- der enhanced many-body interactions. Additionally, transport measurements demonstrate NbGe2 exhibits superconductivity below 2 K. Taken together, our comprehensive results provide the first concrete evidence that NbGe2 is a promising platform for investigating the interplay between non- trivial band topology, possible Weyl fermions, van Hove singularities, and superconductivity in chiral quantum materials.
Keywords: Chiral Topological Superconductivity; Weyl Fermions; Van Hove Singularities; Angle-Resolved Photoemission Spectroscopy