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From Conductor to Insulator

Graphene is one of those materials under vigorous study for use in future electronics. A single honeycomb layer of carbon atoms, it features high electron mobility but no bandgap, so, on its own, doesn’t work well as a semiconductor.

Add another layer, however, and, as we saw in our note on the next logic gate, interesting things may happen.

In particular, some UC Riverside researchers found that so-called bilayer graphene (BLG), which also has high mobility, can become an insulator once the number of electrons drops far enough. They did this by making a BLG sheet one plate of a capacitor, pulling away electrons. This isn’t a gradual process of conductivity changing linearly as electrons are depleted; at a certain point, there’s a fundamental shift in how the electrons organize themselves.

They go so far as to describe this shift as a form of “symmetry breaking,” which gives mass to particles – and they fancy this as the embodiment of a new quantum particle.

You can find more on what’s either a new particle or just another bit of useful knowledge about how to work with graphene in their unusually explanatory release.

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