Description:
<jats:p>The authors realized narrow constrictions in a two-dimensional electron gas (2DEG) with an in-plane asymmetry by means of a hybrid confinement. Unequal sidewalls of the constrictions were formed by combination of a single etched trench in a modulation doped GaAs/AlGaAs heterostructure which cuts through the 2DEG with an adjacent metallic top-gate, which depletes the underlying 2DEG. The two-terminal conductance was analyzed in magnetic fields applied perpendicular to the sample surface. In nonlinear transport, the conductance shows pronounced differences for an inversion of the magnetic field. The asymmetric conductance is related to scattering asymmetries caused by the different sidewalls in the asymmetric constriction.</jats:p>