Two-dimensional electron gas
= Two-dimensional electron gas
{title2=$n_s=N/A$}
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An <electron gas> confined in one spatial direction, with motion available in the other two. Its <Electron> number per unit <area> is $n_s=N/A$. The ideal <Fermi gas> approximation neglects interactions between <Electrons>; an actual <two-dimensional electron gas> can have important interactions. Confinement alone does not require a <magnetic field> or <Landau levels>.