Physicists studying uranium ditelluride have discovered a previously hidden phase boundary that resolves an apparent violation of thermodynamics. Their measurements establish a tetracritical point and provide direct evidence that competing superconducting states can combine into a more complex form of superconductivity ...Read more

Using ultracold atoms in an optical lattice, physicists observed bound excitations moving coherently under conditions that immobilize individual particles. The experiment directly probes fracton-like behavior, in which conservation laws restrict motion but permit collective movement and scattering ...Read more