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We investigate charge transport of pn and npn junctions made from silicene,Si analogue of graphene. The conductance shows the distinct gate-voltagedependences peculiar to the topological and non-topological phases, where thetopological phase transition is caused by external electric field. Namely, theconductance is suppressed in the np regime when the both sides are topological,while in the nn regime when one side is topological and the other side isnon-topological. Furthermore, we find that the conductance is almost quantizedto be 0, 1 and 2. Our findings will open a new way to nanoelectronics based onsilicene.

Charge transport in pn and npn junctions of silicene