论文标题
拓扑绝缘子表面上的绑定状态和可控电流，具有扩展的磁缺陷
Bound states and controllable currents on Topological Insulator surfaces with extended magnetic defects
论文作者
论文摘要
我们表明，拓扑绝缘子表面上的磁线缺陷通常支持自旋和电流一维结合状态的两个不同的分支。我们确定导致结合状态的磁散射的成分。这些分支中的每个分支的速度，因此可以通过旋转表面平面旋转的磁场来独立调整速度。我们计算状态的局部网和自旋分辨密度，以及自旋积累和电荷电流。由于结合状态和散射状态引起的净自旋极化和电流随逐步变化，这是散射电位的静电和磁成分的函数，并且可以通过施加的场来调节。我们讨论了与杂质散射有关的结合状态的稳定性。
We show that a magnetic line defect on the surface of a topological insulator generically supports two distinct branches of spin-polarized and current carrying one-dimensional bound states. We identify the components of magnetic scattering that lead to the bound states. The velocity, and hence spin texture, of each of those branches can be independently tuned by a magnetic field rotated in the plane of the surface. We compute the local net and spin-resolved density of states as well as spin accumulation and charge currents. The net spin polarization and current due to both bound and scattering states vary stepwise as a function of the electrostatic and magnetic components of the scattering potential, and can be tuned by an applied field. We discuss stability of the bound states with respect to impurity scattering.
