Josephson junction chains with long-range interactions: Phase slip proliferation versus Kosterlitz-Thouless transition

Article

关键词: SUPERCONDUCTING QUANTUM POINT;    SPIN-CORRELATION-FUNCTION;    2-DIMENSIONAL XY-MODEL;    ONE-DIMENSION;    FLUCTUATIONS;    SYSTEMS;    ARRAYS;   

DOI  :  10.1103/PhysRevB.83.094509

来源: SCIE

【 摘 要 】

The role of long-range badly screened Coulomb interactions in a one-dimensional chain of Josephson junctions is studied. Correlation functions for the phase correlator are obtained as a function of the Josephson coupling energy, the short-range part of the Coulomb repulsion, and its long-range component. Although quasi-long-range order is no longer possible and the usual Kosterlitz-Thouless transition no longer exists, there are remnants of it. As an application, we calculate the I-V curves for Andreev reflection when a normal metal is placed in contact with the chain. Formally, there is always an offset voltage V-0 below which no current can flow; however, in some regimes V-0 can be negligible. Contrary to what happens without long-range interactions, the Andreev current, as a function of applied voltage, increases faster than any power law. Signatures of long-range interactions and phase slips appear in the I-V curves. A possible application for quasi-one-dimensional thin superconducting wires is outlined.

【 授权许可】

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