New physical behavior, such as Mott insulating behavior, unconventional superconductivity and quantum spin liquid behavior, occurs when electrons inside a material interact with each other. When electrons are confined to lower dimensions such as 2-D planes, these effects can become even stronger.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/12-researchersd.jpg)
Source:
https://phys.org/news/2020-01-unique-orbital-texture-single-layer-d.html