Relevant energy scale in hybrid mesoscopic Josephson junctions
  Transport properties of high quality Nb/semiconductor/Nb long Josephson junctions based on metamorphic In_0.75Ga_0.25As epitaxial layers are reported. Different junction geometries and fabrication procedures are presented that allow a systematic comparison with quasiclassical theory predictions. The impact of junction transparency is highlighted and a procedure capable of yielding a high junction quality factor is identified. 
Franco Carillo, Detlef Born, Vittorio Pellegrini, Francesco Tafuri,   Giorgio Biasiol, Lucia Sorba, Fabio Beltram