Using a light-based technique called pump-probe spectroscopy, the researchers created and probed the behaviors of the excitons in their system – the electrons from the tungsten disulfide and the 'holes' from the tungsten diselenide.

Could be made up and I wouldn't know the difference.

It's crazy though how they're discovering a new material and matter state.

This feels very similar to the magic angle twisted bilayer graphene research that's been going on for a while now. The fact that the bosonic excitons is fascinating, and feels really weird and unexpected for bosons. I have no real idea what the implications of that are though.