Bose-Einstein condensates (BECs) are often described as a "fifth state of matter": a quantum state in which many particles lose their individual identities and behave as one collective object. For more than 60 years, researchers have sought to create such condensates from excitons—electron-hole ...
Source: [Phys.org](https://phys.org/news/2026-08-quantum-fluid-reveals-hidden-states.html)