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Coherently projecting a quantum state may allow it to be probed from a distance. This is now demonstrated for a Yu–Shiba–Rusinov state using a quantum corral.

Topologically trivial and Majorana bound states can show spectral weight near the ends of a chain of magnetic atoms on a superconductor. Here, the authors disentangle the two contributions by augmenting a spin chain with orbitally-compatible nonmagnetic atoms, where a persistent zero-energy spectral weight at the transition between the two parts is observed.

Small clusters of magnetic atoms can behave in very different ways to those same atoms in bulk. Arranging iron atoms one by one into complex but well-defined patterns on a copper surface enables the construction of nanoscale magnetic structures with tailored characteristics.

The Ruderman–Kittel–Kasuya–Yosida interaction indirectly couples the moments of magnetic atoms through conduction electrons. Using a spin-polarized scanning tunnelling microscope, the direction and strength of this interaction between pairs and triplets of isolated atoms on a surface has been imaged directly.

Isolated magnetic atoms doped into a semiconductor represent an interesting system for spintronics applications and a possible means of constructing quantum bits. So far, however, it has not been possible to study the correlation between the local atomic structure and the dopant's magnetic properties. Here, sensitive scanning probe techniques have been developed that allow the spin excitations of individual magnetic dopants within a two-dimensional semiconductor system to be measured.

Proximity-induced superconductivity on a single spin-degenerate quantum level of a surface state confined in a quantum corral on a superconducting substrate built atom by atom by a scanning tunnelling microscope is investigated.

Strategies to tune the surface properties of topological insulators are essential, if they are to find use in applications. Using a combination of theoretical and experimental techniques, this study examines how the properties of ordered ternary topological insulators vary with the content of group IV elements.

Knowledge of the spin structure in parent compounds of unconventional superconductors is crucial for an understanding of the complex physics in these materials. Here, the authors report canted spin structure on the surface as well as on the thin film form of Fe_1+yTe, different from the bulk.

Spin chains on superconductors have been studied as a possible venue for zero-energy Majorana bound states at the ends of the chain. Here, the authors observe localized end states in antiferromagnetic chains, but rule out a Majorana origin of these states by perturbing them with local defects.

Chains of magnetic atoms on the surface of a superconductor are shown to have topologically non-trivial bands that could host Majorana bound states.

Majorana modes are highly non-local quantum states with non-Abelian exchange statistics, which localize at the two ends of finite-size 1D topological superconductors of sufficient length. By precisely positioning magnetic atoms on a superconducting surface, their interaction is tailored such that the precursors of Majorana modes are simultaneously observed on both ends of linear atomic chains.

The influence of spin-orbit coupling on the hybridization of Shiba states in dimers of magnetic atoms on superconducting surfaces remains unexplored. Here, the authors reveal a splitting of atomic Shiba orbitals due to spin-orbit coupling and broken inversion symmetry in antiferromagnetically coupled Mn dimers placed on a Nb(110) surface.

Exploration of the atomic spin interactions promises next generation information technologies. Here the authors show the observation and understanding of the Dzyaloshinskii−Moriya and symmetric anisotropic exchange interactions controlled spin dynamics and stability in Fe cluster-adatom complexes on Pt surfaces.

Scanning tunnelling microscopes can be used to accurately position atoms and measure emergent behaviour arising from interatomic couplings. Here, the authors fabricate a model spin chain and show the formation of a tunable spiral state due to competing Heisenberg and Dzyaloshinskii-Moriya interactions

Koch et al. develop DeepNeo, a deep learning tool for neointimal tissue characterization using optical coherence tomography to look at vascular healing after percutaneous coronary intervention. Authors show comparable performance of this model to clinical experts.

Majorana bound states have possible application in future quantum computing devices but designing platforms where their signatures can be isolated and observed is challenging. Here, the authors report experimental and calculated data for the screening of proximitized superconducting and strongly spin-orbit-coupled heavy metal layers with atom-by-atom assembled chains of transition metal atoms with the aim of realizing large topological minigaps protecting Majorana edge modes.