2013

Quantum spin/valley Hall effect and topological insulator phase transitions in silicene

Quantum spin/valley Hall effect and topological insulator phase transitions in silicene
M. Tahir, A. Manchon, U. Schwingenschlogl
Appl. Phys. Lett. 102, 162412 (2013)​​
M. Tahir, A. Manchon, U. Schwingenschlogl
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2013
We present a theoretical realization of quantum spin and quantum valley Hall effects in silicene. We show that combination of an electric field and intrinsic spin-orbit interaction leads to quantum phase transitions at the charge neutrality point. This phase transition from a two dimensional topological insulator to a trivial insulating state is accompanied by a quenching of the quantum spin Hall effect and the onset of a quantum valley Hall effect, providing a tool to experimentally tune the topological state of silicene. In contrast to graphene and other conventional topological insulators, the proposed effects in silicene are accessible to experiments.