论文标题
边界驱动的旋转链中的巨型磁力
Giant Magnetoresistance in Boundary-Driven Spin Chains
论文作者
论文摘要
在固态物理学中，巨型磁阻是由于外部磁场而引起的电阻的巨大变化。在这里，我们表明，在由强烈耦合的旋转的弱相互作用层组成的自旋链中可以使用巨型磁倍率。这是针对所有系统尺寸的发现，甚至可以降低到四个旋转的最小系统。推动效果的机制是能量光谱中的不匹配，导致旋转激发在层之间的边界处反射。这种不匹配以及因此电流可以通过外部磁场来控制，从而导致巨大的磁磁性。根据强耦合自旋的能级提出了一个简单的规则，用于确定磁场影响下自旋传输的行为。
In solid state physics, giant magnetoresistance is the large change in electrical resistance due to an external magnetic field. Here we show that giant magnetoresistance is possible in a spin chain composed of weakly interacting layers of strongly coupled spins. This is found for all system sizes even down to a minimal system of four spins. The mechanism driving the effect is a mismatch in the energy spectrum resulting in spin excitations being reflected at the boundaries between layers. This mismatch, and thus the current, can be controlled by external magnetic fields resulting in giant magnetoresistance. A simple rule for determining the behavior of the spin transport under the influence of a magnetic field is presented based on the energy levels of the strongly coupled spins.
