QUANTUM TRANSMISSION IN AN OUT-OF-PLANE CROSSED-WIRE JUNCTION

We have investigated numerically the quantum transmission properties o f an electron in a cross junction of two out-of-plane wires. One elect ron waveguide is placed on top of the other and the coupling between t hem takes place in the direction perpendicular to the orthogonal wire axes. We find that the transmission exhibits resonant structures due t o quasibound states in the intersection region even if the device cons ists of straight waveguides. This is in contrast to the conventional t wo-dimensional in-plane crossed-wire junction, in which an incident mo de does not couple with the bound states. Over a large energy range in the single-mode regime, the transmission into the side lead is found to be absent, resulting in a divergence of the bend resistance.