MAGNETORESISTANCE OSCILLATIONS IN 50-NM-WIDE GAAS ALXGA1-XAS MULTIPLE-EDGE QUANTUM WIRES/

We fabricated a 50-nm-wide GaAs/AlxGa1-xAs multiple-quantum-wire struc ture with the cleaved-edge overgrowth technique and investigated the c haracteristics of its low-temperature magnetoresistances. A clear Shub nikov-de Haas oscillation was observed and found to contain unexpected oscillatory components. By analyzing the magnetoresistance and its te mperature dependence, the formation of one-dimensional subbands was re vealed. On the basis of a semiclassical model, the width of lateral co nfinement was estimated and found to be similar to 50 nm.