Abstract
Two-dimensional electrons in surface states above liquid helium, and other cryogenic substrates, form the simplest conducting system known. Below 1 K, the electrons are in the quantum ground state for vertical motion but can have in-plane zero-field mobilities µ higher than the best semiconducting heterostructures. They form a non-degenerate electron fluid or a classical Wigner crystal, though on bulk helium the electron density is limited, n < 2 × 1013 m-2, by an electrohydrodynamic instability. Higher densities, approaching the Fermi degenerate region, can be obtained on helium films or solid hydrogen and neon substrates. Electrons are scattered from vapour atoms, ripplons or the surface roughness of a solid substrate.
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Lea, M.J. (1997). Magnetotransport and the Hall Effect. In: Andrei, E.Y. (eds) Two-Dimensional Electron Systems. Physics and Chemistry of Materials with Low-Dimensional Structures, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-1286-2_8
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DOI: https://doi.org/10.1007/978-94-015-1286-2_8
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