Tangential question: are the electron "fluid dynamics" of graphene inherently "2D" because it's such a "layered" material and we're talking about such thin slices?

That is, do vortices in the flow behave as if confined to 2 dimensions?

Even if we have to given it a nitrogen bath, it would be incredibly interesting if you could experiment with 2D electron fluid dynamics just by creating graphene structures. (Which I believe can be created via laser circuit printing -- considerably easier than the process for similar things now.)