It's called a two - dimensional hole gas — a counterpart to something known as a two - dimensional electron gas. (sciencedaily.com)
And scientists must tweak the crystal's two - dimensional electron gas to electronically vary its output frequencies, something casual crystal buyers probably won't be able to do. (sciencedaily.com)
«Recreating outer space in the lab: Extending thermodynamics to out of equilibrium electron gas in a magnetic nozzle.» (sciencedaily.com)