Abstract
Conductance quantization in the absence and in the presence of a magnetic field is discussed for a split-gate constriction with a local potential at the bottleneck forming a saddle. Simple criteria for the occurrence of conductance steps and the accuracy of quantization are given in terms of the curvatures of the saddle.
- Received 8 November 1989
DOI:https://doi.org/10.1103/PhysRevB.41.7906
©1990 American Physical Society
