首页|Janus monolayers Fe2SSeX2(X=Ga,In,and Tl):Robust nontrivial topology with high Chern number
Janus monolayers Fe2SSeX2(X=Ga,In,and Tl):Robust nontrivial topology with high Chern number
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Janus monolayers Fe2SSeX2(X=Ga,In,and Tl):Robust nontrivial topology with high Chern number
High-performance quantum anomalous Hall(QAH)systems are crucial materials for exploring emerging quantum physics and magnetic topological phenomena.Inspired by layered FeSe materials with excellent superconducting proper-ties,the Janus monolayers Fe2SSeX2(X=Ga,In and T1)are built by the decoration of Ga,In and T1 atoms in monolayer Fe2SSe.In first-principles calculations,Fe2SSeX2 have stable structures and prefer ferromagnetic(FM)ordering,and can be considered as Weyl semimetals without spin-orbit coupling.For out-of-plane(OOP)magnetic anisotropy,large non-trivial gaps are opened and the Fe2SSeX2 are predicted to be large-gap QAH insulators with a high Chern number C=2,proved by two chiral edge states and Berry curvature.When the magnetization is flipped,the two chiral edge states can be simultaneously changed and C=-2 can be obtained,revealing the fascinating behavior of chiral spin-edge state locking.It is found that the QAH properties of Fe2SSeX2 are robust against strain.In particular,nontrivial topological quantum states can spontaneously appear for Fe2SSeGa2 and Fe2SSeIn2 because the orientations of the easy magnetic axis are adjusted from in-plane to OOP by the biaxial strain.Our studies provide excellent candidate systems to realize QAH properties with a high Chern number,and suggest more experimental explorations combining superconductivity and topology.
Weyl semimetalhigh Chern numberchiral spin-edge state lockingrobust
贾康、董晓晶、王培吉、张昌文
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School of Physics and Technology,Institute of Spintronics,University of Jinan,Jinan 250022,China
School of Physics and Physical Engineering,Qufu Normal University,Qufu 273165,China
Weyl semimetal high Chern number chiral spin-edge state locking robust
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