A theoretical condensed matter physicist who modeled quantized electrical conductance through a narrow constriction as transmission through a saddle-shaped potential. Opening successive transverse modes produces conductance steps, while the saddle's curvatures control how sharply transmission rises. This gives a concrete microscopic model of a quantum point contact and explains why the shape of its bottleneck matters.[ref]
Quantized transmission of a saddle-point constriction by M. Büttiker. Abstract: split-gate saddle potential, conductance steps and quantization accuracy
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