TRANSPORT THROUGH A 2DEG CHANNEL WITH SUPERCONDUCTING BOUNDARIES

We have investigated transport through a channel with superconducting boundaries where-electrons are confined by Andreev reflection. Superco nducting phase-sensitive transport is discussed using qualitative argu ments. The transfer resistance R(t) through the channel as well as the resistance R(i) between the injector and the channel have been measur ed as a function of the phase difference phi Between the superconducti ng boundaries. It is not yet clear that the observed oscillation in re sistance can be attributed to quasi-particle phase-sensitive transport . The oscillation amplitude in R(t) due to the transmitted current mod ulation is less than 0.1% in this experiment.