Anomalous Josephson effect in noncentrosymmetric superconductors

作者：Zhang, Huan; Wang, Jun; Liu, Jun-Feng^*

来源：Applied Physics Letters, 2016, 108(10): 102601.

DOI：10.1063/1.4943637

• SYSTEM

We reveal the underlying physics of the anomalous Josephson effect in a magnetic Josephson junction between two noncentrosymmetric superconductors. The key point is that the two effective superconducting gaps provide two sets of Andreev bound states which carry two supercurrents with different amplitudes. When the magnetization direction of the ferromagnet is suitably chosen, the two supercurrents experience opposite phase shifts from the conventional sinusoidal current-phase relation. Then the total Josephson current results in a continuously tunable ground-state phase difference by adjusting the ferromagnet parameters and the triplet-singlet ratio of noncentrosymmetric superconductors. The emergence of anomalous Josephson current can definitely confirm the existence of triplet pairing and the ground-state phase difference serves as a tool to determine the triplet-singlet ratio of noncentrosymmetric superconductors.

• 出版日期2016-3-7
• 单位东南大学; 南方科技大学