Here we propose to get amplified spin current in a cascade way by injecting hot electrons into a series of Rashba systems, which is similar to the multilayer structure in a cascade laser.

• 自旋晶体管的三个主要环节是自旋的注入、操控和探测， 相当于一般晶体管的源、栅和漏。本工作建议用级联注入热电子于拉什巴系统， 形成逐级放大的自旋流。