Talk-Polywell.org

Faking-out electrons to make them act like they are moving along graphene, or in a strong 60T magnetic field that doesn't really exist:
Molecular graphene heralds new era of 'designer electrons'

And a similar experiment using Potassium atoms instead of Carbon Monoxide:
Research team finds way to simulate graphene Dirac points

So it's the shape of the "corral" and not the fence material that matters so much. (Yeeehhaaaahhh! Git along, electron doggies).