论文标题
旋转超级流诱导的自旋积累
Spin accumulation induced by a singlet supercurrent
论文作者
论文摘要
我们表明，由无旋的单线库珀对携带的超电流可以诱导约瑟夫森交界处正常金属层中的自旋积累。当非平衡自旋能量模式在正常金属中激发，例如通过铁电极之间的施加温度梯度激发时，就会发生这种现象。没有超级流，旋转积聚在约瑟夫森交界处消失。使用超电流，可以生成空间反对称的自旋积累，可以通过隧穿到极化检测器电极来测量。我们通过由单重库珀对流引起的多普勒移位的综合效应来解释诱导的自旋积累的物理起源，而在正常金属中激发的自旋能模式。这种效果表明，即使在常规超导体中的单线库珀对也可以进行旋转控制，这一发现可以打开超导旋转的新观点。
We show that a supercurrent carried by spinless singlet Cooper pairs can induce a spin accumulation in the normal metal interlayer of a Josephson junction. This phenomenon occurs when a nonequilibrium spin-energy mode is excited in the normal metal, for instance by an applied temperature gradient between ferromagnetic electrodes. Without supercurrent, the spin accumulation vanishes in the Josephson junction. With supercurrent, a spatially antisymmetric spin accumulation is generated that can be measured by tunneling to a polarized detector electrode. We explain the physical origin of the induced spin accumulation by the combined effect of a Doppler shift induced by a flow of singlet Cooper pairs, and the spin-energy mode excited in the normal metal. This effect shows that spin control is possible even with singlet Cooper pairs in conventional superconductors, a finding which could open new perspectives in superconducting spintronics.
