Current modulation in fine electrode by hot electron passing through GaInAs/InP double slits

We attempted to observe the interference pattern of a hot electron passing through a 25 nm pitch GaInAs/InP buried double slit by 80 nm periodical electrodes. To get sufficient isolation of the fine electrodes from one another, we inserted a small conduction band discontinuity and etched surfaces between the electrodes. We made five period fine electrodes. Unfortunately, three electrodes did not show the current and the observed current from one electrode was too large. However, the one remaining electrode showed the modulation of the current in magnetic field. The result was compared with the theoretical hot electron interference pattern.