Ai Yamakage, Motohiko Ezawa, Yukio Tanaka, Naoto Nagaosa
We investigate Klein tunneling of pn and npn junctions made from silicene, Si analogue of graphene. The conductance shows the distinct gate-voltage dependences peculiar to the topological and non-topological phases, where the topological phase transition is caused by external electric field. Namely, the conductance 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 is non-topological. Furthermore, we find that the conductance is almost quantized to 0, 1 and 2. Hence we can use a silicene pn junction as a digital field-effect transistor. Our findings will open a new nanoelectronics based on silicene.
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http://arxiv.org/abs/1303.6599
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