An experimental physicist who coauthored the 1988 observation of quantized electrical conductance in quantum point contacts. A gate narrowed a constriction in a two-dimensional electron gas. The conductance changed in steps as transverse conducting modes became available, making a controllable semiconductor device a direct demonstration that a narrow channel carries current through discrete quantum modes.[ref]
Quantized conductance of point contacts by B. J. van Wees and others. Abstract: gate-controlled width, conductance steps and quantized transverse momentum
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