Observation of electron diffraction due to a reflection grating in an electron wave transistor

We investigate quantum transport in the presence of an electron reflection grating fabricated in an electron wave transistor structure. The grating is made up of a periodically corrugated potential wall by which the electron waves are coherently scattered. We observe a number of peaks with respect t o the gate voltage in the low-temperature conductance measurements. The con ductance oscillations are attributed to the electron diffraction effect, an d the peak positions agree well with those predicted by the Fraunhofer diff raction condition. (C) 1999 Academic Press.