Physics

Statistical correlations between particles play a central role in the study of complex quantum systems. A new study introduces microscopic detection of ultracold molecules and demonstrates the measurement of two-particle correlations.

Computer simulations have revealed the topological nature of the liquid–liquid phase transition in colloidal water. This finding might lead to an experimental observation of this topological transition with colloids as building blocks.

Soft magnetic materials can be magnetized and demagnetized by weak magnetic fields, but lack the strength, toughness and malleability needed for many applications. An alloy that solves this problem has now been developed.

The International Union for Pure and Applied Physics (IUPAP) celebrates its centenary this year, but its beginnings were far from easy. Roberto Lalli and Jaume Navarro reflect on IUPAP’s evolving role in promoting international cooperation.