Controllable temporal spin splitter via δ-doping in parallel double δ-magnetic-barrier nanostructure

We theoretically investigate the control of spin-polarized dwell time by δ-doping in a parallel double δ-magnetic-barrier nanostructure, which can be realized experimentally by depositing two asymmetric ferromagnetic stripes at the top and bottom of an InAs/Al x In1−x As heterostructure, respectively. Dwell time is still spin-polarized even if a δ-doping is included inside. Both the magnitude and the sign of the spin-polarized dwell time can be manipulated by changing the weight or position of δ-doping. Therefore, this nanostructure can be employed as a structurally controllable temporal spin splitter for spintronic device applications.