(a) Schematic representation of the magnetic step. The solid arrows and dashed lines correspond to the delta-function like magnetic field and its vector potential, respectively. (b) Propagations of Dirac fermions in different regions of the magnetic step structure. The width of the middle region is .
Plots of transmission probability through the magnetic step for up-spin as functions of (a) fermion energy and (b) incident angle. The typical energy scale in use is , and .
(Color online) Conductance as a function of fermion energy for different spins. Each line corresponds to different spins. is the unit of conductance. (Inset: magnification of the conductance near the threshold energy)
Spin polarization of the conductance through the magnetic step.
Plots of the transmission probability through the magnetic step modulated by the electrostaic delta potential as functions of (a) fermion energy and (b) incident angle. This delta potential is located at , and it strength is used.
(Color online) Effect of the electric modulation on the spin transport through the magnetic step. The spin polarization for the magnetic step is dramatically changed by the delta potential, .
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