Reflectionless tunneling in ballistic normal-metal–superconductor junctions

M. Schechter, Y. Imry, Y. Levinson

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We investigate the phenomenon of reflectionless tunneling in ballistic normal-metal–superconductor (NS) structures using a semiclassical formalism. It is shown that applied magnetic field and superconducting phase difference both impair the constructive interference leading to this effect, but in a qualitatively different way. This is manifested both in the conductance and in the shot noise properties of the system considered. Unlike diffusive systems, the features of the conductance are sharp and enable fine spatial control of the current, as well as single-channel manipulations. We discuss the possibility of conducting experiments in ballistic semiconductor-superconductor structures with smooth interfaces and some of the phenomena, specific to such structures, that could be measured. A general criterion for the barrier at NS interfaces, though large, to be effectively transparent to pair current is obtained.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - 1 Jan 2001
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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