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Surface states that cross the Fermi level give rise to a surface Fermi contour, in complete analogy with the notion of a bulk Fermi surface for metals. The shape of the Fermi contour is important when discussing the screening at the surface, Fermi surface nesting, Kohn anomalies, etc. To determine the Fermi contour, the usual technique of choice has been angle-resolved photoemission. Recently, we...
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