When a collection of atoms is cooled to just above absolute zero, they can act as one, and control light through their electrical and magnetic interactions with it
Source:
https://www.newscientist.com/article/2253825-ultracold-atoms-can-work-together-to-shape-or-steer-light/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home