论文标题
拓扑电荷，自旋和热晶体管
Topological charge, spin and heat transistor
论文作者
论文摘要
自旋泵送在于由于相邻的铁磁体的进攻，将自旋电流注入非磁性材料。除了泵送自旋外，进动始终会导致热量泵送，但是在存在自旋轨道纠缠的情况下，它也会导致电荷电流。我们研究了电荷，自旋和热的泵送，在该设备中，超导体和量子旋转厅绝缘子与铁磁绝缘子接触近距离接触。我们表明该设备支持拓扑效应引起的两个强大的操作制度。在一个体制中，由于散射矩阵形式主义中的拓扑绕组数量的反射系数，泵送电荷，自旋和热量是量化的，并且相互关联 - 在汉密尔顿形式主义的情况下转化为Chern号。在第二个制度中，Majorana零模式因拓扑保护的完美Andreev反射而关闭电流的泵送。我们表明，可以利用这两个拓扑效应的相互作用，以便该设备作为强大的电荷，自旋和热晶体管的工作。
Spin pumping consists in the injection of spin currents into a non-magnetic material due to the precession of an adjacent ferromagnet. In addition to the pumping of spin the precession always leads to pumping of heat, but in the presence of spin-orbital entanglement it also leads to a charge current. We investigate the pumping of charge, spin and heat in a device where a superconductor and a quantum spin Hall insulator are in proximity contact with a ferromagnetic insulator. We show that the device supports two robust operation regimes arising from topological effects. In one regime, the pumped charge, spin and heat are quantized and related to each other due to a topological winding number of the reflection coefficient in the scattering matrix formalism -- translating to a Chern number in the case of Hamiltonian formalism. In the second regime, a Majorana zero mode switches off the pumping of currents owing to the topologically protected perfect Andreev reflection. We show that the interplay of these two topological effects can be utilized so that the device operates as a robust charge, spin and heat transistor.
