首页|Spin direction dependent quantum anomalous Hall effect in two-dimensional ferromagnetic materials
Spin direction dependent quantum anomalous Hall effect in two-dimensional ferromagnetic materials
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We propose a scheme for realizing the spin direction-dependent quantum anomalous Hall effect(QAHE)driven by spin-orbit couplings(SOC)in two-dimensional(2D)materials.Based on the sp3 tight-binding(TB)model,we find that these systems can exhibit a QAHE with out-of-plane and in-plane magnetization for the weak and strong SOC,respec-tively,in which the mechanism of quantum transition is mainly driven by the band inversion of px,y/Pz orbitals.As a concrete example,based on first-principles calculations,we realize a real material of monolayer lT-SnN2/PbN2 exhibiting the QAHE with in-plane/out-of-plane magnetization characterized by the nonzero Chern number C and topological edge states.These findings provide useful guidance for the pursuit of a spin direction-dependent QAHE and hence stimulate immediate experimental interest.
topological phase transitionquantum anomalous Hall effectfirst-principles calculations
杨宇贤、张昌文
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School of Physics and Technology,University of Jinan,Jinan 250022,China
Taishan Scholar Program of Shandong ProvinceIndependent Cultivation Program of Innovation Team of Jinan City国家自然科学基金
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