| Abstract: | We investigate theoretically the edge channel transport in a HgTe waveguide modulated bytwo magnetic barriers. For an electron incident from a quantum-spin-Hall state in leads,the transmission can depend strongly on the relative orientation (parallel orantiparallel) of the two magnetic barriers as its energy is near the bulk conduction bandof leads. For the antiparallel configuration, the transmission is spin-independent and canbe suppressed drastically. For the parallel configuration, the electron can transmitnearly perfectly for a proper spin orientation. This contrast in transmission indicatesthat the proposed edge-state device may serve as a magnetic switch and a spin filter. |
