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Schematic illustration of TIG. Regions I and II denote the xy and yz surfaces of TI, respectively. Region III means a graphene sheet deposited atop an ordinary insulator. A voltage source drives a current through TIG.
The spin current (a) and charge current (b) as a function of for , the insets illustrate their dependence for .
The spin current as a function of barrier strength with , , , respectively. It is seen that, with increasing , a novel oscillatory behavior of the spin current as a function of is present in all cases.
The charge current as a function of barrier strength with , , , respectively.
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