Temperature and magnetic field studies of quantum-well-coupled Josephson junctions

In this thesis I present a study of the temperature, magnetic field and geometry dependent critical current of semiconductor quantum well-coupled Josephson junctions that are nominally ballistic in length, L, but not in width, W >> L. I compare data for I_c( T) of our junctions to a theory for long, diffusive SNS junctions that has been verified for all-metal devices. I also compare I _c(B) to various theories for 1D SQUID arrays, trapped flux and different electrode widths. The studies described suggest that normal reflections at S/N interfaces are integral to explaining the temperature dependent behavior, while the magnetic field dependent behavior is not as well fit by theory.