: a population of free electrons in a vacuum or in a metallic conductor
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The islands are grown on a gallium arsenide/aluminum gallium arsenide (GaAs/AlGaAs) heterostructure that hosts a two-dimensional electron gas, enabling precise control of electrons.—
Ameya Paleja,
Interesting Engineering,
3 Apr. 2026 This layer of electrons—called a two-dimensional electron gas (2DEG)—is highly concentrated and moves with little resistance.—IEEE Spectrum,
11 Aug. 2025 Using an approach proposed four years ago, physicists sent an electron gas through a teeny-tiny particle collider to tease out weird behaviors — especially fractional electric charges — that only arise if anyons are around.—
Stephen Ornes,
Discover Magazine,
12 Dec. 2020 Quantum fluctuations may cause that solid to sublime, producing materials in which the electrons move freely — a kind of electron gas.—Quanta Magazine,
28 Feb. 2017