论文标题
非临界约瑟夫森效应的理论
Theory of nonreciprocal Josephson effect
论文作者
论文摘要
不同材料之间的杂交界处通常会产生整流效果。例如，PN连接用于二极管。另一方面，假定两个超导体之间的约瑟夫森交界处显示当前两个方向之间的对称响应，即，对于当前$ i $的符号变化，电压下降$ v $是反对称的。但是，在约瑟夫森交界处的左右侧面，电荷状态的积累状态应在可能导致非偏置响应之间存在不对称性。从理论上讲，在这里，我们证明了非重点$ i $ - $ v $特征出现，这是由于经典和量子制度中的这种充电能量差异。该结果将为设计和开发约瑟夫森二极管铺平道路。
The hetero junction between the different materials often gives the rectification effect; e.g., pn junction is used for diode. On the other hand, the Josephson junction between the two superconductors is assumed to show symmetric response between the two directions of the current, i.e., the voltage drop $V$ is anti-symmetric with respect to the sign change of the current $I$. However, there should be an asymmetry between the states of charge accumulation on right and left sides of the Josephson junction, which can lead to the nonreciprocal responses. Here we demonstrate theoretically that nonreciprocal $I$-$V$ characteristic appears due to this charging energy difference both in the classical and quantum regimes. This result will pave a route to design and develop the Josephson diode.
