Crystals and gemstones can be more than just beautiful—they can be deadly. Minerals like arsenopyrite, cinnabar, galena, and torbernite carry toxic substances like arsenic, mercury, lead, and ...

A team experimentally observed higher-order and fractional discrete time crystals (DTCs) in periodically driven Rydberg ...

Nonlinear crystals — commonly used to double or triple the frequency of laser light or create tunable light sources called optical parametric oscillators (OPOs) — have been in use for decades ...

Scientists created photonic time crystals, unique materials that amplify light and could enhance lasers, sensors, and ...