Enhanced strongly modulated spin transmission of Fano–Rashba mesoscopic ring structure

One-dimensional Rashba quantum ring structure with two leads subjected to a weak external magnetic field is proposed as a possible candidate for spintronic current modulators. By tuning spin–orbit coupling and magnitude of external magnetic field, resonance and antiresonance behavior can be found in our investigation. Comparing with results in other structures like quantum wires with local or periodic Rashba interaction, the T-shaped structure, more broader energy range of vanishing small transmission and larger on/off transmission ratio can be found in the structure and Fano–Rashba interference behaviors of the quantum ring model. Moreover, it is found the enhanced robustness of these interference against random Anderson-type disorder of device, which may conduce to the real application of this device.