论文标题
控制无磁场的自旋 - Bloch-Rashba旋转器
Controlling spin without magnetic fields -- the Bloch-Rashba rotator
论文作者
论文摘要
我们考虑在晶格电位中保持的量子粒子的动力学，并进行时间依赖性的自旋轨道耦合。倾斜晶格会导致粒子执行Bloch振荡，并通过在运动过程中适当地改变Rashba相互作用，可以逐渐旋转粒子的旋转。即使RashBA耦合只能通过少量改变，也可以通过从连续的振荡中累积旋转来获得大型自旋旋转。我们展示了如何选择自旋轨道耦合的时间依赖性以最大程度地提高每个周期的旋转，因此如何使用该方法来产生精确且可控的自旋旋转器Bloch-Rashba旋转器，而无需施加的磁场。
We consider the dynamics of a quantum particle held in a lattice potential, and subjected to a time-dependent spin-orbit coupling. Tilting the lattice causes the particle to perform Bloch oscillations, and by suitably changing the Rashba interaction during its motion, the spin of the particle can be gradually rotated. Even if the Rashba coupling can only be altered by a small amount, large spin-rotations can be obtained by accumulating the rotation from successive oscillations. We show how the time-dependence of the spin-orbit coupling can be chosen to maximize the rotation per cycle, and thus how this method can be used to produce a precise and controllable spin-rotator, the Bloch-Rashba rotator, without requiring an applied magnetic field.
