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首页> 外文期刊>Physical review >Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate
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Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate

机译：三重态库珀对与单重态冷凝物相互作用时的手性和自旋转变

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We show that the fully polarized triplet s-wave component is characterized not only by the spin direction, but also by chirality. Interaction of a polarized triplet component and a singlet one results in creation of triplet Cooper pairs with opposite spin direction or of different chiralities. Such spin transformation leads to interesting phenomena in multiterminal magnetic Josephson junctions. We calculate the dc Josephson current I_J in a multiterminal Josephson contact of the S_m/S'_m type with "magnetic" superconductors S_m that generate fully polarized triplet components. The superconductors S_m are attached to magnetic insulators (filters) which let pass electrons with a fixed spin direction only. The filter axes are assumed to be oriented antiparallel to each other. The Josephson current is zero in two-terminal Josephson junction, i.e., in S/S_m or in S_m/S'_m contact. But in the three-terminal Josephson junction, with another S superconductor attached to the normal wire, the finite current I_J appears flowing from the S superconductor to S_m superconductors. The currents through the right (left) superconductors S_m are opposite in sign, I_R = I_J = I_C sin(X_R + X_L - 2X) = -IL, where X_(L/R) and X are the phases of superconductors S_m, S'_m, and S, respectively. We discuss possibilities of experimental observation of the effect.
机译：我们表明，完全极化的三重态s波分量不仅以自旋方向为特征，而且还以手性为特征。极化三重态组分和单重态组分的相互作用导致产生具有相反自旋方向或不同手性的三重态库珀对。这种自旋转变在多端磁性约瑟夫逊结中引起有趣的现象。我们计算S_m / n / S'_m类型的多端约瑟夫森接触与产生完全极化三重态分量的“磁性”超导体S_m的直流约瑟夫森电流I_J。超导体S_m附接到磁绝缘体（滤波器），该磁绝缘体仅使电子以固定的自旋方向通过。假定滤波器轴的方向彼此反平行。在两个端子的Josephson结中，即S / n / S_m或S_m / n / S'_m接触中，约瑟夫森电流为零。但是在三端约瑟夫逊结中，另一条S超导体连接到法线，有限电流I_J出现从S超导体流向S_m超导体。通过右（左）超导体S_m的电流符号相反，I_R = I_J = I_C sin（X_R + X_L-2X）= -IL，其中X_（L / R）和X是超导体S_m，S'的相位。 _m和S。我们讨论了对该效果进行实验观察的可能性。

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