Spin blocking effect in symmetric double quantum well due to Rashba spin-orbit coupling

We report a theoretical study of the spin-dependent electronic current flowing laterally through the In_0.53Ga_0.47As/In_0.52Al_0.48As double quantum well (DQW) structure, where the values of the Rashba spin-orbit parameter α_R are opposite in sign but equal in magnitude between the constituent quantum wells. By tuning the channel length of DQW and the magnitude of the externally applied in-plane magnetic field, one can block the transmission of one spin (e.g., spin-up) component, enabling us to obtain a spin-polarized current. Our experimental progress toward realizing the proposed device is also reported.

This work was supported by JSPS KAKENHI Grant Number 23360001 and 22104007