Chemists create a 2D heavy fermion

Researchers have synthesized the first 2D heavy fermion. The material, a layered intermetallic crystal composed of cerium, silicon, and iodine (CeSiI), has electrons that are 1000x heavier and is a new platform to explore quantum phenomena.

https://www.sciencedaily.com/releases/2024/01/240117143932.htm