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Andreev tunneling into a one-dimensional Josephson junction array

G. Falci·Rosario Fazio·A. Tagliacozzo·G. Giaquinta
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Abstract

In this letter we consider Andreev tunneling between a normal metal and a one dimensional Josephson junction array with finite-range Coulomb energy. The $I-V$ characteristics strongly deviate from the classical linear Andreev current. We show that the non linear conductance possesses interesting scaling behavior when the chain undergoes a T=0 superconductor-insulator transition of Kosterlitz-Thouless-Berezinskii type. When the chain has quasi-long range order, the low lying excitation are gapless and the $I-V$ curves are power-law (the linear relation is recovered when charging energy can be disregarded). When the chain is in the insulating phase the Andreev current is blocked at a threshold which is proportional to the inverse correlation length in the chain (much lower than the Coulomb gap) and which vanishes at the transition point.

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G. Falci, Rosario Fazio, A. Tagliacozzo, G. Giaquinta. 1995-01-16. Andreev tunneling into a one-dimensional Josephson junction array. https://doi.org/10.1209/0295-5075%2F30%2F3%2F008

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