Nature, Published online: 22 July 2026; doi:10.1038/s41586-026-10817-9

An insulator-free topological waveguide architecture comprising four inequivalent photonic valley half-semimetals arranged in a parallel, cyclic configuration and stacked very close to one another demonstrates robust, multi-lane, unidirectional light transport with 100% spatial efficiency.

Nature, Published online: 15 July 2026; doi:10.1038/s41586-026-10801-3

A molten salt, high-pressure synthesis method enables solution-based production of diverse refractory metal nitride nanocrystals, expanding access to technologically important nitride materials for advanced applications.