Researchers from the University of Manchester (with help from an international team of scientists) discovered that if you stack two graphene sheets on on top of the other (bi-layer graphene) in a certain way, it actually cools down when hit with laser light.

The two graphene sheets are aligned so one sheet is rotated by 11.3 degrees. With a specific laser energy, instead of heating up like any "normal" material - it cools down. The researchers explain that the photons of the laser absorb the vibration energy of the atoms - instead of the other way around.