Supercurrent induced by injection at V = Delta/e in a three-terminal superconductor-semiconductor device

We report on injection induced enhancement of the supercurrent in a mesosco pic three terminal superconductor semiconductor device. The samples consist ed of three superconducting Aluminium electrodes to the same piece of highl y doped and degenerate n-GaAs semiconductor. At the base temperature of the experiment (240mK) the DC Josephson current across two of the superconduct ing electrodes had a maximum for zero injection current from the third elec trode. However, when a finite injection current was passed from the third A l electrode at the injection bias V = Delta(T)/e, a second maximum in criti cal supercurrent was observed. This second maximum persisted to temperature s where the non-injection supercurrent had vanished.