论文标题
拓扑约瑟夫森连接中的奇数库珀对辅助的相可可电子传输
Phase-tunable electron transport assisted by odd-frequency Cooper pairs in topological Josephson junctions
论文作者
论文摘要
我们考虑在二维拓扑绝缘子的边缘形成的有限尺寸拓扑结局，该结与传统超导体的距离，并研究了库珀对对称性对电子传输的影响。我们发现，由于有限的连接尺寸，电子传输可通过整个连接的超导相位差$ ϕ $高度调节。在零频率和$ ϕ =π$下，由于有限的连接大小的相互作用以及拓扑结合状态在交界处的中间，该设置显示出消失的本地Andreev反射和完美的正常传播。我们透露，这种惊人的行为使奇数库珀对成为拓扑结的唯一对运输造成的配对类型。因此，我们的论文为奇数库珀对提供了高度可调的检测方案。
We consider a finite-size topological Josephson junction formed at the edge of a two-dimensional topological insulator in proximity to conventional superconductors and study the impact of Cooper pair symmetries on the electron transport. We find that, due to the finite junction size, electron transport is highly tunable by the superconducting phase difference $ϕ$ across the junction. At zero frequency and $ϕ=π$, the setup exhibits vanishing local Andreev reflection and perfect normal transmission due to the interplay of finite junction size and formation of topological Andreev bound states in the middle of the junction. We reveal that this striking behavior enables odd-frequency Cooper pairs to become the only type of pairing inside the topological junction that contribute to transport. Our paper thus offers a highly tunable detection scheme for odd-frequency Cooper pairs.
