QUASI-ONE-DIMENSIONAL ELECTRON-GAS AND ITS MAGNETIC DEPOPULATION IN A QUANTUM-WIRE PREPARED BY OVERGROWTH ON A CLEAVED EDGE OF ALGAAS/GAAS MULTIPLE-QUANTUM WELLS

We have succeeded in the formation of a quasi-one-dimensional electron gas on an edge surface of an A]GaAs/GaAs multiple quantum well (MQW) structure with well width of 100 nm. The sample was prepared by the exposure of a cleaved surface of an MQW substrate and subsequent overgrowth of a doped AlGaAs layer on the edge. The existence of electrons on the edge surface and their one dimensionality are, respectively, evidenced by the angular dependence of magnetoresistance and the magnetic depopulation effect.