Abstract
We have performed an investigation of quantum pointcontacts (QPCs) defined by split gates on AlGaAs/GaAsheterostructures in order to understand the effects of surface stateson the transport characteristics of mesoscopic devices. We compareresults from transport measurements on a large number of QPCs withsimulations using a Poisson-Schrödinger solver in which theeffects of surface states are taken into account. We show thatsurface properties strongly affect the conductance of QPCs, and thata simple model for surface states allows us to reproduce withreasonable accuracy the pinch-off voltage of QPCs with different gatelayouts.
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