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Schematic of a four-terminal magnetic guiding device including contacts T1 (terminal 1), T2 (terminal 2), and G1, G2 (electrical ground 1, 2) on the surface of a 3D TI. The arrows in the middle region indicate that incident electrons can leak out of the channel or can be confined in the channel but with different effective velocities.
(a) Energy spectrum for the few lowest channel modes for , , where is the channel width. The inset shows the probability for the states indicated by solid circular dot. (b) The same as Fig. 2(a) but for , . The inset is a zoom of the box region.
The phase diagram as a function of the incident energy and transverse wave vector . The shaded regions indicate the appearance of bound states for: (a) , and (b) .
Conductance vs incident energy for opposite current directions. is the conductance from terminal 1 to terminal 2 (see Fig. 1), while from terminal 2 to terminal 1. (a) Correspond to Fig. 4(a), , , and (b) correspond to Fig. 4(b), , .
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