Kamra Lina Johnsen, Linder Jacob
Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Phys Rev Lett. 2024 May 31;132(22):226002. doi: 10.1103/PhysRevLett.132.226002.
When a spin-splitting field is introduced to a thin film superconductor, the spin currents polarized along the field couples to energy currents that can only decay via inelastic scattering. We study spin and energy injection into such a superconductor where spin-orbit impurity scattering yields inverse spin-Hall and spin-swapping currents. We show that the combined presence of a spin-splitting field, superconductivity, and inelastic scattering gives rise to a strong enhancement of the ordinary inverse spin-Hall effect, as well as unique inverse spin-Hall and spin-swapping signals orders of magnitude stronger than the ordinary inverse spin-Hall signal. These can be completely controlled by the orientation of the spin-splitting field, resulting in a long-range charge and spin accumulations detectable much further from the injector than in the normal state. While the enhanced inverse spin-Hall signals offer a major improvement in spin detection sensitivity, the unique spin-swap signals can be utilized for designing devices where both the spin and current directions are controlled and altered throughout the geometry.
当向薄膜超导体引入自旋分裂场时，沿该场极化的自旋电流会与只能通过非弹性散射衰减的能量电流耦合。我们研究了自旋和能量注入到这样一种超导体中的情况，其中自旋 - 轨道杂质散射会产生逆自旋霍尔电流和自旋交换电流。我们表明，自旋分裂场、超导性和非弹性散射的共同存在会导致普通逆自旋霍尔效应的强烈增强，以及比普通逆自旋霍尔信号强几个数量级的独特逆自旋霍尔和自旋交换信号。这些信号可以通过自旋分裂场的取向完全控制，从而导致在比正常状态下离注入器更远的地方可检测到的长程电荷和自旋积累。虽然增强的逆自旋霍尔信号在自旋检测灵敏度方面有了重大改进，但独特的自旋交换信号可用于设计在整个几何结构中自旋和电流方向都能被控制和改变的器件。
