首页|Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn
Discovery of controllable high Chern number quantum anomalous Hall state in tetragonal lattice FeSIn
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Quantum anomalous Hall(QAH)insulators have excellent properties driven by fancy topological physics,but their practical application is greatly hindered by the observed temperature of liquid nitrogen,and the QAH insulator with high Chem number is conducive to spintronic devices with lower energy consumption.Here,we find that monolayer FeSIn is a good candidate for realizing the QAH phase;it exhibits a high magnetic transition temperature of 221 K and tunable C=±2 with respect to magnetization orientation in the y-z plane.After the application of biaxial strain,the magnetic axis shifts from the x-y plane to the z direction,and the effect of the high C and ferromagnetic ground state on the stress is robust.Also,the effect of correlation U on C has been examined.These properties are rooted in the large size of the Fe atom that contributes to ferromagnetic kinetic exchange with neighboring Fe atoms.These findings demonstrate monolayer FeSIn to be a major template for probing novel QAH devices at higher temperatures.
high Chem numberWeyl semimetalsquantum anomalous Hall insulatormagnetic transition temperature
任小浪、张昌文
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School of Physics and Technology,Institute of Spintronics,University of Jinan,Jinan 250022,China
国家自然科学基金山东省"泰山学者"项目Independent Cultivation Program of Innovation Team of Jinan City
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