Stable two-dimensional dumbbell stanene: a quantum spin Hall insulator

Physical Review B 90, 121408(R) (2014)

Stable two-dimensional dumbbell stanene: a quantum spin Hall insulator

Peizhe Tang, Pengcheng Chen, Wendong Cao, Huaqing Huang, Seymur Cahangirov, Lede Xian, Yong Xu, Shou-Cheng Zhang, Wenhui Duan, Angel Rubio

We predict from first-principles calculations a novel structure of stanene with dumbbell units (DB), and show that it is a two-dimensional topological insulator with inverted band gap which can be tuned by compressive strain. Furthermore, we propose that the boron nitride sheet and reconstructed (2×2) InSb(111) surfaces are ideal substrates for the experimental realization of DB stanene, maintaining its non-trivial topology. Combined with standard semiconductor technologies,such as magnetic doping and electrical gating, the quantum anomalous Hall effect, Chern half metallicity and topological superconductivity can be realized in DB stanene on those substrates. These properties make the two-dimensional supported stanene a good platform for the study of new quantum spin Hall insulator as well as other exotic quantum states of matter.

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We thank B. H. Yan for stimulating discussions. We acknowledge support from the Min- istry of Science and Technology of China (Grant Nos. 2011CB921901 and 2011CB606405) and the National Natural Science Foundation of China (Grant No. 11334006). AR, SC, and LX acknowledge financial support from the European Research Council Grant DYNamo (ERC-2010-AdG No. 267374) Spanish Grants (FIS2010-21282-C02-01), Grupos Consol- idados UPV/EHU del Gobierno Vasco (IT578-13) and EC project CRONOS (280879-2 CRONOS CP-FP7). YX, and SCZ acknowledge the Defense Advanced Research Projects Agency Microsystems Technology Office, MesoDynamic Architecture Program (MESO) through the contract number N66001-11-1-4105 and FAME, one of six centers of STARnet, a Semiconductor Research Corporation program sponsored by MARCO and DARPA. The calculations were done on the “Explorer 100” cluster system of Tsinghua University.

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