CONDUCTANCE OSCILLATIONS IN OVERGROWN SUB100NM INP GA0.25IN0.75AS QUANTUM WIRES/

We report the observation of strong conductance oscillations as a func tion of Fermi energy in the quantized plateau region in epitaxially ov ergrown, heterostructurally defined, 90 nm wide InP/Ga0.25In0.75As qua ntum wires (QWRs). The oscillations are strong at liquid-helium temper atures but disappear either at temperatures around 10 K or if the exci tation current is increased to 350 nA, We propose that the observed os cillations are caused by quantum interference of electron waves reflec ted at the sharp boundaries between the quantum wire and the wide 2DEG , defined by the heterostructure. Details of the fabrication of QWRs a s narrow as 60 nm are also reported.