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arXiv 0802.2783cond-mat.supr-con
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窄薄膜带中的约瑟夫森结

Josephson junctions in narrow thin-film strips

Maayan Moshe, V. G. Kogan, R. G. Mints

摘要:

研究了窄边型薄膜约瑟夫森结中最大超电流的场依赖性。假设该结延伸穿过宽度W远小于珍珠长度的薄膜带;膜厚度远小于伦敦穿透深度。我们计算的最大超电流内的非本地约瑟夫森电动力学,考虑到杂散场影响隧穿电流。在W远小于薄膜约瑟夫森长度的情况下,沿结的相位差仅取决于结的几何形状和所施加的场,但与约瑟夫森临界电流密度无关,即,它是普遍的。最大超电流的零点只有在大磁场中才是等距的(不像与体块组的结的情况);它们被一个比体块结小得多的磁场隔开。最大超电流的峰值与所施加场的平方根成反比地减小,即,慢于1/H。

英文摘要:

We study the field dependence of the maximum supercurrent in narrow edge-type thin-film Josephson junctions. It is assumed that the junction extends across thin-film strip of width W that is much less than the Pearl length; the film thickness is much less than the London penetration depth. We calculate the maximum supercurrent within nonlocal Josephson electrodynamics, which takes into account the stray fields affecting tunneling currents. In the case when W is much less than the thin-film Josephson length, the phase difference along the junction depends only on the junction geometry and the applied field, but is independent of the Josephson critical current density, i.e., it is universal. Zeros of the maximum supercurrent are equidistant only in large fields (unlike the case of junctions with bulk banks); they are spaced by a field that is much smaller than the one of bulk junctions. Peaks of the maximum supercurrent decrease inversely proportional to the square root of the applied field, i.e., slower than 1/H for the bulk.

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