纳米磁性/石墨烯杂化体系中的自旋掺杂极化放大
Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems
摘要：
非平衡电子自旋极化的产生、自旋输运和自旋检测在许多量子器件中是基本的。我们证明了磁性纳米点的晶格通过载流子交换增强了单层石墨烯中的电子自旋极化。我们通过连续检测到的电子自旋共振（ESR）的变体探测自旋极化，并观察到纳米点的存在介导的共振放大。每个纳米点局部地将过剩的自旋极化载流子注入石墨烯中，并且所有“自旋热点”的集合在宏观长度处的石墨烯层中产生非平衡电子自旋极化。每当点间距离与自旋扩散长度相当或小于自旋扩散长度时，就会发生这种情况。
英文摘要：
The generation of non-equilibrium electron spin polarization, spin transport, and spin detection are fundamental in many quantum devices. We demonstrate that a lattice of magnetic nanodots enhances the electron spin polarization in monolayer graphene via carrier exchange. We probed the spin polarization through a resistively-detected variant of electron spin resonance (ESR) and observed resonance amplification mediated by the presence of the nanodots. Each nanodot locally injects a surplus of spin-polarized carriers into the graphene, and the ensemble of all "spin hot spots" generates a non-equilibrium electron spin polarization in the graphene layer at macroscopic lengths. This occurs whenever the interdot distance is comparable or smaller than the spin diffusion length.
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