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首页> 外文期刊>Physica, B. Condensed Matter >Current-phase relation of a ballistic asymmetric double superconductor-normal-metal-superconductor junction
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Current-phase relation of a ballistic asymmetric double superconductor-normal-metal-superconductor junction

机译：弹道非对称双超导体-法向金属-超导体结的电流-相位关系

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The zero-temperature current-phase (I-phi) relation (CPR) of a mesoscopic, ballistic, and asymmetrically stacked, double superconductor-normal-metal-superconductor (SNS) junction is studied. Here phi is the phase difference between the two superconducting end-electrodes. The lack of configuration symmetry in such asymmetric SNSNS junctions forbids a simple choice of values for the phase phi(2), of the middle superconductor. We propose to determine the values of phi(2), by equating the currents in the two normal regions. Two features in the CPR are found. First, the CPR of the asymmetric junction has a cutoff feature, whose origin is best demonstrated in the long middle superconductor (large L-2) cases, when the critical current of the double SNS junction is bounded by the SNS junction that has the longer normal region. This cutoff feature is more pronounced for longer L-2 and for higher degree of junction asymmetry. Second, in regions other than the cutoff region, the CPR of the asymmetric junction deviates only within a few percent from the CPR of the symmetric junction which has the same total length L-Total in the normal regions and the same L-2. This is in contrast with the greater sensitivity the CPR has to the changes in L-Total or L-2. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 15]
机译：研究了介观，弹道和不对称堆叠的双超导体-正常金属-超导体（SNS）结的零温度电流-相位（I-phi）关系（CPR）。 phi是两个超导端电极之间的相位差。在这种不对称的SNSNS结中缺乏配置对称性，使得无法简单选择中间超导体的phi（2）相值。我们建议通过使两个正常区域中的电流相等来确定phi（2）的值。在CPR中找到两个功能。首先，不对称结的CPR具有截止特性，当双SNS结的临界电流受较长的SNS结限制时，其起源最好在长的中超导体（大L-2）情况下得到证明。正常区域。对于更长的L-2和更高的结不对称度，此截止特征更为明显。第二，在截止区域以外的区域中，非对称结的CPR仅与对称结的CPR偏离几个百分点，而对称结的CPR在正常区域的总长度L-Total和相同的L-2。这与CPR对L-Total或L-2的变化更加敏感。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：15]

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