ABSTRACT
Can superconductivity survive also in quasi-1D systems or do uctuations suppress phase coherence, thus disrupting any supercurrent? e answer to this question would clearly be of both fundamental interest and practical importance. On one hand, investigations of this subject de nitely help to encover novel physics and shed more light on the crucial role of superconducting uctuations in 1D wires. On the other hand, rapidly progressing miniaturization of nanodevices opens new horizons for applications of superconducting nanocircuits and requires a better understanding of the fundamental limitations of the phenomenon of superconductivity in reduced dimensions. is chapter is devoted to a detailed discussion of the nontrivial interplay between superconductivity and the uctuations in metallic nanowires and nanorings.
