量子线路中自旋电流的产生、存储和释放
Production, storage and release of spin currents in quantum circuits
摘要：
如果量子环与弹道电路的连接不是对称的，那么量子环与外部磁场的耦合会很强。通过分析理论和计算机模拟，我表明，适当连接的环可以用来泵电流的电线，提高了一些有趣的新现象。人们可以通过使用旋转磁场或让环围绕导线旋转来将自旋极化电流泵入导线中。这种方法不需要自旋轨道相互作用，也没有对导带填充的严格要求。另一方面，另一种方法在（固定）环的平面中使用时间相关的磁场在半填充时起作用。这可以用来泵一个纯自旋电流，由环中的自旋轨道相互作用激发。可以使用可磁化体作为存储单元，以与电容器存储电荷大致相同的方式集中和保存磁化。用这种方法得到的极化可以用来在导线中产生自旋电流。当存储单元交换它们的极化时，这些电流显示出有趣的振荡，并且振荡的强度和幅度可以通过调谐用于连接单元的导线的电导来控制。
英文摘要：
Quantum rings connected to ballistic circuits couple strongly to external magnetic fields if the connection is not symmetric. By analytical theory and computer simulation I show that properly connected rings can be used to pump currents in the wires giving raise to a number of interesting new phenomena. One can pump spin polarized currents into the wires by using rotating magnetic fields or letting the ring rotate around the wire. This method works without any need for the spin-orbit interaction, and without stringent requirements about the conduction band filling. On the other hand, another method works at half filling using a time-dependent magnetic field in the plane of the (fixed) ring. This can be used to pump a pure spin current, excited by the the spin-orbit interaction in the ring. One can use magnetizable bodies as storage units to concentrate and save the magnetization in much the same way as capacitors store electric charge. The polarization obtained in this way can then be used on command to produce spin currents in a wire. These currents show interesting oscillations while the storage units exchange their polarizations and the intensity and amplitude of the oscillations can controlled by tuning the conductance of the wire used to connect the units.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
