Non-Topological Edge-Localized Yu-Shiba-Rusinov States in CrBr${}_3$/NbSe${}_2$ Heterostructures

Abstract

Topological superconductivity is predicted to emerge in certain magnet-superconductor hybrid systems. Here, we revisit the heterostructure of insulating monolayer CrBr${}_3$ and NbSe${}_2$, for which different conclusions on the presence of topological superconductivity have been reported. Using low-temperature scanning tunneling microscopy and (shot noise) spectroscopy, we find that the superconducting gap well inside the CrBr3 islands is not affected by magnetism. At the island edges, we observe Yu-Shiba-Rusinov (YSR) states at a variety of in-gap positions, including zero energy. The absence of topological superconductivity is verified by extensive dI/dV measurements at the CrBr${}_3$ island edges. Our results ask for a more detailed understanding of the interaction between magnetic insulators and superconductors.

References in corpus (40)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Helical liquids and Majorana bound states in quantum wires
• New directions in the pursuit of Majorana fermions in solid state systems
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Search for Majorana fermions in superconductors
• Suppressing quantum errors by scaling a surface code logical qubit
• Majorana Fermion Induced Resonant Andreev Reflection
• Majorana fermions in chains of magnetic atoms on a superconductor
• Evidence for Majorana bound state in an iron-based superconductor
• Quantum error correction below the surface code threshold
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Topological superconducting phase in helical Shiba chains
• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• Topological superconductivity in a van der Waals heterostructure
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Quantum point contact as a probe of a topological superconductor
• Long range coherent magnetic bound states in superconductors
• Two-dimensional topological superconductivity in Pb/Co/Si(111)
• Single magnetic adsorbates on s-wave superconductors
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Atomic-Scale Interface Engineering of Majorana Edge Modes in a 2D Magnet-Superconductor Hybrid System
• A novel platform for two-dimensional chiral topological superconductivity
• Tunneling processes into localized subgap states in superconductors
• Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport
• Evidence of topological Shiba bands in artificial spin chains on superconductors
• Doubled Shot Noise In Disordered Normal-Metal-Superconductor Junctions
• Doubled Full Shot Noise in Quantum Coherent Superconductor - Semiconductor Junctions
• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• Scaling of Yu-Shiba-Rusinov energies in the weak-coupling Kondo regime
• Electronic and magnetic characterization of epitaxial CrBr${}_3$ monolayers
• Electron and Cooper pair transport across a single magnetic molecule explored with a scanning tunneling microscope
• Amplifier for scanning tunneling microscopy at MHz frequencies
• Imaging doubled shot noise in a Josephson scanning tunneling microscope
• Coherent and incoherent tunneling into YSR states revealed by atomic scale shot-noise spectroscopy
• Single-electron charge transfer into putative Majorana and trivial modes in individual vortices
• Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr3/NbSe2 heterostructure
• Direct visualization of quasiparticle concentration around superconducting vortices