Materials2026-01-191 minarXiv:2601.13231expressA Ruler for Invisible CrystalsA tiny crystal flake rests on a substrate like an autumn leaf on a palm. It's thinner than a human hair, yet inside it quantum effects are simmering: superconductivity, magnetic order, quantum spin liquid.R. Küchler·S. Panja·S. Wirth·P. GegenwartRobert HookeWilliam Lawrence Braggcrystal lattice👍👎☆SimplePopularAdvanced