Two-dimensional Shiba lattices as possible platform for crystalline topological superconductivity

Abstract

Localized or propagating Majorana boundary modes are the key feature of topological superconductors. They are rare in naturally-occurring compounds, but the tailored manipulation of quantum matter offers opportunities for their realization. Specifically, lattices of Yu-Shiba-Rusinov bound states $-$ Shiba lattices $-$ that arise when magnetic adatoms are placed on the surface of a conventional superconductor can be used to create topological bands within the superconducting gap of the substrate. Here, using scanning tunnelling microscopy to create and probe adatom lattices with single atom precision we reveal two signatures consistent with the realization of two types of mirror symmetry protected topological superconductors. The first has edge modes as well as higher-order corner states, and the second has symmetry-protected bulk nodal points. In principle, their topological character and boundary modes should be protected by the spatial symmetries of the adatom lattice. Our results highlight the potential of Shiba lattices as a platform to design the topology and sample geometry of 2D superconductors.

arXiv commentPublished in Nature Physics (https://doi.org/10.1038/s41567-023-02104-5)

References in corpus (41)

• Unpaired Majorana fermions in quantum wires
• Topological insulators and superconductors: ten-fold way and dimensional hierarchy
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Quantized Electric Multipole Insulators
• Periodic table for topological insulators and superconductors
• Higher-Order Topological Insulators
• Topolectrical circuit realization of topological corner modes
• Majorana fermions in chains of magnetic atoms on a superconductor
• Higher-order topological insulators and superconductors protected by inversion symmetry
• Topology of crystalline insulators and superconductors
• Second-order topological insulators and superconductors with an order-two crystalline symmetry
• Topological superconductivity in a van der Waals heterostructure
• Observation of novel edge states in photonic graphene
• End states and subgap structure in proximity-coupled chains of magnetic adatoms
• Two-dimensional topological superconductivity in Pb/Co/Si(111)
• Topological surface states in nodal superconductors
• Atomic-Scale Interface Engineering of Majorana Edge Modes in a 2D Magnet-Superconductor Hybrid System
• A novel platform for two-dimensional chiral topological superconductivity
• Exploring a proximity-coupled Co chain on Pb(110) as a possible Majorana platform
• Orbital Picture of Yu-Shiba-Rusinov Multiplets
• Topological Yu-Shiba-Rusinov chain from spin-orbit coupling
• Coupled Yu-Shiba-Rusinov states in molecular dimers on NbSe${}_2$
• Evidence of topological Shiba bands in artificial spin chains on superconductors
• Mapping the orbital structure of impurity bound states in a superconductor
• Controlled length-dependent interaction of Majorana modes in Yu-Shiba-Rusinov chains
• Refined symmetry indicators for topological superconductors in all space groups
• Wave-function hybridization in Yu-Shiba-Rusinov dimers
• Probing magnetic interactions between Cr adatoms on the $\beta$-Bi${}_2$Pd superconductor
• Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers
• Atomic-scale spin-polarization maps using functionalized superconducting probes
• Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on a superconductor
• Controlling in-gap end states by linking nonmagnetic atoms and artificially-constructed spin chains on superconductors
• Tunneling dynamics between superconducting bound states at the atomic limit
• Tuning interactions between spins in a superconductor
• On the preparation and electronic properties of clean superconducting Nb(110) surfaces
• Edge-dependent topology in Kekulé lattices
• Observation of tunable single-atom Yu-Shiba-Rusinov states
• Non-Majorana modes in diluted spin chains proximitized to a superconductor
• Topological Nonsymmorphic Crystalline Superconductors
• Atomic Manipulation of In-gap States on the $\beta$-Bi${}_2$Pd Superconductor
• Coupling of Yu-Shiba-Rusinov states in 1D chains of Fe atoms on Nb(110)

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• Construction of topological quantum magnets from atomic spins on surfaces
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• Floquet second-order topological Anderson insulator hosting corner localized modes
• Wave-function engineering on superconducting substrates: Chiral Yu-Shiba-Rusinov molecules
• Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr3/NbSe2 heterostructure
• Topological meron-antimeron domain walls and skyrmions in a low-symmetry system
• Spin Excitations of High Spin Iron(II) in Metal-Organic Chains on Metal and Superconductor
• Emergence of Exotic Spin Texture in Supramolecular Metal Complexes on a 2D Superconductor
• Predicting topological invariants and unconventional superconducting pairing from density of states and machine learning
• Gate-tunable topological superconductivity in a supramolecular electron spin lattice
• Majorana modes in trapped-ion system and their Floquet engineering
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Family of Aperiodic Tilings with Tunable Quantum Geometric Tensor
• Magnetic flux induced topological superconductivity in magnetic atomic rings
• Anisotropy of Yu-Shiba-Rusinov states in NbSe${}_2$
• Magnetic flux induced higher-order topological superconductivity
• Charge-density-wave control by adatom manipulation and its effect on magnetic nanostructures
• Josephson junction arrays as a platform for topological phases of matter
• Signatures of Amorphous Shiba State in FeTe${}_{0.55}$Se${}_{0.45}$
• Universal quantum control over Majorana zero modes
• Interacting Crystalline Topological Insulators in two-dimensions with Time-Reversal Symmetry
• Sensing the binding and unbinding of anyons at impurities
• Scanning tunneling microscopy study of helimagnetic monolayer CrBr2 on s-wave superconductor NbSe2: a topologically trivial system due to weak interfacial coupling
• Dimensional crossover of class D real-space topological invariants
• The Non-collinear Path to Topological Superconductivity
• Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling