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Spin and momentum filtering of electrons on the surface of a topological insulator
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

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) .

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spin and momentum filtering of electrons on the surface of a topological insulator