TUNNELING INTO ONE-DIMENSIONAL JOSEPHSON CHAINS AND LUTTINGER LIQUIDS

One-dimensional arrays of Josephson junctions have been studied becaus e of their unusual zero-temperature superconductor-insulator phase tra nsitions. Furthermore, their low-energy Hamiltonian coincides with tha t of a Luttinger liquid. Hence 1-D Josephson junction arrays provide a physical realization of this model system. In order to explore these similarities we discuss 1-D arrays with defects, making contact to rec ent studies of transport in Luttinger liquids. We then study Andreev t unnelling between a Josephson chain and a normal metal and between a s uperconductor and a Luttinger liquid. In both cases, the current-volta ge characteristics strongly deviate From a linear dependence.