Experimental and computational study demonstrates strong surface state impacts on quantum point contact conductance, indicating simplified surface models accurately predict device pinch-off.
We have performed an investigation of quantum point contacts (QPCs) defined by split gates on AlGaAs/GaAs heterostructures in order to understand the effects of surface states on the transport characteristics of mesoscopic devices. We compare results from transport measurements on a large number of QPCs with simulations using a Poisson-Schrödinger solver in which the effects of surface states are taken into account. We show that surface properties strongly affect the conductance of QPCs, and that a simple model for surface states allows us to reproduce with reasonable accuracy the pinch-off voltage of QPCs with different gate layouts.
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Fiori et al. (2002) studied this question.
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