标题： 与三端自旋输运相关的正常电极和铁磁电极之间的共振磁隧穿 显示英文标题

标题： Resonant magneto-tunneling between normal and ferromagnetic electrodes in relation to the three-terminal spin transport

摘要： 最近提出的三端自旋输运机制[Y. Song和H. Dery, Phys. Rev. Lett. 113, 047205 (2014)]基于通过杂质在铁磁电极和正常电极之间的共振隧穿。电流对弱外部磁场的敏感性源于自旋阻塞，而这种自旋阻塞则由强局域排斥所启用。我们证明，当单粒子描述适用时，即使没有排斥，这种敏感性仍然存在。在该描述中，我们精确计算了电极之间的共振隧穿电流。磁阻机制与自旋阻塞完全不同，其起因于虚拟隧穿幅度的干涉。铁磁电极中的自旋不平衡导致这种干涉以及由此产生的Zeeman能级耦合。这种耦合也影响关联区域中的电流。 显示英文摘要

摘要： The recently suggested mechanism [Y. Song and H. Dery, Phys. Rev. Lett. 113, 047205 (2014)] of the three-terminal spin transport is based on the resonant tunneling of electrons between ferromagnetic and normal electrodes via an impurity. The sensitivity of current to a weak external magnetic field stems from a spin blockade, which, in turn, is enabled by strong on-site repulsion. We demonstrate that this sensitivity exists even in the absence of repulsion when a single-particle description applies. Within this description, we calculate exactly the resonant-tunneling current between the electrodes. The mechanism of magnetoresistance, completely different from the spin blocking, has its origin in the interference of virtual tunneling amplitudes. Spin imbalance in ferromagnetic electrode is responsible for this interference and the resulting coupling of the Zeeman levels. This coupling also affects the current in the correlated regime.