论文标题
拓扑电流分隔器
A topological current divider
论文作者
论文摘要
我们研究了与二维拓扑绝缘子的螺旋边缘模式的电气连接中的铁磁铅制成的杂化连接的运输特性。在此系统中，表征拓扑绝缘体的弹道边缘模式的时间逆转对称性在铁磁区域内被明确破裂。这种冲突情况在界面上产生了异常的传输现象，这是注射电流的自旋极化与拓扑绝缘体内部运行的自旋摩肌锁定机构之间相互作用的表现。我们表明，源自铁磁区域的自旋极化电流在拓扑绝缘子内部具有不同螺旋性的边缘通道维持的空间分离的分支电流中不对称。上面的发现提供了拓扑电流分隔线的工作原理，其中分支电流的相对强度取决于传入电流的极化。我们讨论了这种效应在旋转型中的相关性，例如，它提供了一种测量铁磁电极产生的电流极化的替代方法。
We study the transport properties of a hybrid junction made of a ferromagnetic lead in electrical connection with the helical edge modes of a two-dimensional topological insulator. In this system, the time reversal symmetry, which characterizes the ballistic edge modes of the topological insulator, is explicitly broken inside the ferromagnetic region. This conflict situation generates unusual transport phenomena at the interface which are the manifestation of the interplay between the spin polarization of the injected current and the spin-momentum locking mechanism operating inside the topological insulator. We show that the spin polarized current originated in the ferromagnetic region is asymmetrically divided in spatially separated branch currents sustained by edge channels with different helicity inside the topological insulator. The above findings provide the working principle of a topological current divider in which the relative intensity of the branch currents is determined by the polarization of the incoming current. We discuss the relevance of this effect in spintronics where, for instance, it offers an alternative way to measure the current polarization generated by a ferromagnetic electrode.
