Mode Coupling in Ballistic Quantum Wires with Double Constrictions

抄録

We have studied the effect of constrictions on the conductance of ballistic quantum wires having double constrictions. Unlike the ideal quantum wires with no constriction, the conductance of these double constricted quantum wires shows peak and dip structures in quantized conductance steps for both symmetric and asymmetric cases. The origin of these dip and peak structures seen in the conductance steps are clarified for these symmetric and asymmetric systems by mode coupling analysis.