Nature Physics, Published online: 11 November 2024; doi:10.1038/s41567-024-02656-0
After 30 years of extensive research, the nature of the unconventional superconductivity in Sr2RuO4 is still not fully understood. This Perspective summarizes the controversies surrounding this and discusses future research.
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- Thirty years of puzzling superconductivity in Sr<sub>2</sub>RuO<sub>4</sub>
- Diffusive light pipesNature Physics, Published online: 01 November 2024; doi:10.1038/s41567-024-02669-9 Optical waveguides that route light are a core technology of modern photonics and the bedrock of the global communications network. A surprising diffusion mechanism for guiding light has now been identified, and it is strangely close to home.
- Energy transport in diffusive waveguidesNature Physics, Published online: 01 November 2024; doi:10.1038/s41567-024-02665-z Waveguides—often based on total internal reflection—underpin many photonic technologies, including fibre networks for broadband communications. Now a different type of waveguide based on physical diffusion in a scattering medium is demonstrated.
- No heat flow in charge-neutral grapheneNature Physics, Published online: 01 November 2024; doi:10.1038/s41567-024-02674-y The ground state of electrons in charge-neutral graphene in a strong magnetic field has not been conclusively identified. Thermal transport measurements narrow down the possible candidates, with evidence that the ground state does not conduct heat.
- Braiding reflectionless states in non-Hermitian magnonicsNature Physics, Published online: 01 November 2024; doi:10.1038/s41567-024-02667-x Extending topological braids of complex energy bands to non-Hermitian systems of magnons—the quanta of spin waves—is a crucial step in the development of spin-based topological devices. This has now been experimentally demonstrated.
- Superconducting circuits feel the pull of synthetic magnetismNature Physics, Published online: 31 October 2024; doi:10.1038/s41567-024-02671-1 Superconducting qubits can be fabricated and controlled in large numbers, which makes them an appealing platform for quantum simulations of many-body physics. However, a scalable way of implementing electromagnetism has been lacking — until now.
- A synthetic magnetic vector potential in a 2D superconducting qubit arrayNature Physics, Published online: 30 October 2024; doi:10.1038/s41567-024-02661-3 Arrays of superconducting transmon qubits can be used to study the Bose–Hubbard model. Synthetic electromagnetic fields have now been added to this analogue quantum simulation platform.
- Imprinted atomic displacements drive spin–orbital order in a vanadate perovskiteNature Physics, Published online: 29 October 2024; doi:10.1038/s41567-024-02686-8 Different facets of an orthorhombic substrate can stabilize different ordering patterns in a perovskite oxide, even in the absence of differences in strain and polarity mismatches.
