论文标题
弹道SNS三明治作为约瑟夫森交界处
Ballistic SNS sandwich as a Josephson junction
论文作者
论文摘要
该论文发展了弹道SNS三明治的理论，其中约瑟夫森效应的存在而没有接近效应。该理论考虑了电荷保护定律施加的限制以及超导差距与Andreev级别能量间距的不可通信性。这导致了对以前作品的一些结论的修订。在一维情况下，弹道SNS三明治基态的约瑟夫森阶段不一定为零，但可能具有从0到$π$的任何值。如果此值为$π$，这是一个$π$交界处，以前是众所周知的。在以前的研究中预测的Andreev水平的能量间距在温度下的抑制或高于Andreev水平的能量间距，在一维情况下不会发生。 在零温度下，任何维度的弹道SNS三明治都不是一个弱连接。这导致了不寻常的特性：在正常层的约瑟夫森等离子体模式不存在，而在正常和超导层中具有相同的伦敦穿透深度的Meisner效应。
The paper develops the theory of the ballistic SNS sandwich, in which the Josephson effect exists without the proximity effect. The theory takes into account restrictions imposed by the charge conservation law and the incommensurability of the superconducting gap with the Andreev level energy spacing. This resulted in revisions of some conclusions of previous works. In the one-dimensional case the Josephson phase of the ground state of the ballistic SNS sandwich is not necessarily zero but may have any value from 0 to $π$. If this value is $π$ this is a $π$ junction, which was well known before. The suppression of the supercurrent at temperatures on the order or higher than the Andreev level energy spacing, which was predicted in previous investigations, does not take place in the one-dimensional case. At zero temperature the ballistic SNS sandwich of any dimensionality is not a weak link. This leads to unusual properties: the absence of the Josephson plasma mode localized at the normal layer and the Meisner effect with the same London penetration depth in the normal and the superconducting layers.
