Observation of the Kondo screening cloud

In research published in Nature, an international research group has ended a fifty-year quest by directly observing a quantum phenomenon known as a Kondo screening cloud. This phenomenon, which is important for many physical phenomena such as high-temperature superconductivity, is essentially a cloud that masks magnetic impurities in a material. It was known to exist but its spatial extension had never been experimentally observed, creating controversy over whether such an extension actually existed.

Read more at Nature: 
https://www.nature.com/articles/s41586-020-2058-6 

The paper was also featured in CityU Research:
https://www.cityu.edu.hk/research/stories/2020/03/12/worlds-first-experimental-observation-kondo-cloud