论文标题
Landauer残余电阻率偶极子的旋转类似物的表面上的拓扑绝缘子表面上的旋转类似物
A spintronic analog of the Landauer residual resistivity dipole on the surface of a disordered topological insulator
论文作者
论文摘要
Landauer“残留电阻率偶极子”是通过无序培养基中电子传输中众所周知的概念。当缺陷/散射器反映出撞击电子的电荷在散射器的一侧堆积并在另一侧的正电荷时，它会形成。这导致形成影响培养基电阻率的微观电偶极子。在这里，我们表明，同等的实体在自旋极化电子传输中通过无序拓扑绝缘子（TI）的表面形成。当电子从Ti表面上的散射器反射时，旋转不平衡在散射器周围形成，从而导致旋转电流以与注入的自旋电流相同或相反方向流动，从而增加或降低自旋电阻率。它还破坏了旋转摩托车锁定并在散射器周围产生磁场。后者将在散射器通过时会导致旋转旋转，从而辐射电磁波并实现振荡器。如果交流电流通过Ti而不是静电电流，则磁场将以相同频率的电流频率和辐射电磁波振荡，从而使散射器充当微型天线。
The Landauer "residual resistivity dipole" is a well-known concept in electron transport through a disordered medium. It is formed when a defect/scatterer reflects an impinging electron causing negative charges to build up on one side of the scatterer and positive charges on the other. This results in the formation of a microscopic electric dipole that affects the resistivity of the medium. Here, we show that an equivalent entity forms in spin polarized electron transport through the surface of a disordered topological insulator (TI). When electrons reflect from a scatterer on the TI surface, a spin imbalance forms around the scatterer, resulting in a spin current that flows either in the same or the opposite direction as the injected spin current and hence either increases or decreases the spin resistivity. It also destroys spin-momentum locking and produces a magnetic field around the scatterer. The latter will cause transiting spins to precess as they pass the scatterer, thereby radiating electromagnetic waves and implementing an oscillator. If an alternating current is passed through the TI instead of a static current, the magnetic field will oscillate with the frequency of the current and radiate electromagnetic waves of the same frequency, thus making the scatterer act as a miniature antenna.
