Publication Date:
2016-02-24
Description:
Topological property of the dumbbell (DB) stanene, more stable than the stanene with a honeycomb lattice, is investigated by using ab initio methods. The magnetic DB stanene demonstrates an exotic quantum anomalous Hall (QAH) effect due to inversion of the Sn spin-up p x,y and spin-down p z states. The QAH gap is found to be opened at Γ point rather than the usual K and K′ points, beneficial to observe the effect in experiments. When a 3% tensile strain is applied, a large nontrivial gap (∼50 meV) is achieved. Our results provide another lighthouse for realizing QAH effects in two-dimensional systems.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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