JOSEPHSON EFFECT OF THE SUPERCONDUCTING QUANTUM POINT CONTACT
JOSEPHSON EFFECT OF THE SUPERCONDUCTING QUANTUM POINT CONTACT
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DOI：
10.1103/physrevb.45.10563
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发表时间：
1992-05-01
影响因子：
3.7
通讯作者：
TSUKADA, M
中科院分区：
文献类型：
--
作者：
FURUSAKI, A;TAKAYANAGI, H;TSUKADA, M
从理论上研究了二维超导体-半导体-超导体结（即超导量子点接触）中收缩的直流约瑟夫森效应，并与超导相干长度进行了比较。结果表明，在适当条件下，弹道超导量子点接触的临界电流随其宽度逐步增大。阶跃高度通常取决于超导能隙和结参数。本文还研究了超导体-半导体界面处法向反射的影响。
The dc Josephson effect of a constriction in a two-dimensional superconductor-semiconductor-superconductor junction, i.e., a superconducting quantum point contact, is investigated theoretically for both long and short constriction lengths compared with the superconducting coherence length. It is shown that the critical current of a ballistic superconducting quantum point contact increases stepwise as a function of its width under appropriate conditions. The step height generally depends on both the superconducting energy gap and junction parameters. The effect of normal reflections at the superconductor-semiconductor interface is also examined.