Scientists can learn a lot about a quantum material by watching how it responds to light. In magnetic semiconductors, one especially useful messenger is the exciton: a pairing of a negatively charged electron and the positively charged "hole" it leaves behind. Until now, excitons in magnetic ma...
Source: [Phys.org](https://phys.org/news/2026-06-magnet-excitons-knob-magnetic.html)