Ferromagnetic coupling in a two-dimensional Cairo pentagonal Ni_(2)(TCNQ)_(2) lattice  

作　　者：Aizhu Wang Hongguang Wang Xiaopeng Wang Na Ren Longhua Ding Xin Yu Mingwen Zhao 

机构地区：[1]Institute for Advanced Interdisciplinary Research,University of Jinan,Jinan,Shandong,250022,China [2]Qingdao Institute for Theoretical and Computational Sciences,Shandong University,Qingdao,Shandong,266237,China [3]School of Physics and State Key Laboratory of Crystal Materials,Shandong University,Jinan,Shandong,250100,China

出　　处：《Journal of Materiomics》2022年第3期627-632,共6页无机材料学学报（英文）

基　　金：A.W.greatly appreciates the National Natural Science Foundation of China(No.11904131);the Natural Science Foundation of Shandong Province(No.ZR2019BA006);M.Z.thanks the supports from the National Natural Science Foundation of China(No.11774201);the Taishan scholarship of Shandong Province.N.R.appreciates the National Natural Science Foundation of China(No.51972148);L.D.thanks the support from the National Natural Science Foundation of China(No.51802118).

摘　　要：Magnetism has revolutionized important technologies,and continues to bring forth new phenomena in emergent materials and reduced dimensions.Here,using first-principles calculations,we demonstrate that the already-synthesized two-dimensional(2D)Ni-tetracyanoquinodimethane(Ni_(2)(TCNQ)_(2))lattice is a stable ferromagnetism material with multiple spin-polarized Dirac cones.The conical bands in proximity of the Fermi level can be tuned by external tensile strain and show the fourfold degenerate electronic states at the critical tensile strain of~2.35%,whose energy dispersion is consistent with 2D Cairo pentagonal lattice.In addition,spin-orbital coupling can open a band gap at the Dirac point of A,leading to topologically nontrivial electronic states characterized by the non-zero Chern number and the edge states of nanoribbon.Our results offer versatile platforms for the realization of massless spintronics with full-spin polarization in 2D Cairo pentagonal Ni_(2)(TCNQ)_(2) Lattice.

关 键 词：First-principles calculations Ferromagnetic coupling Linear dispersion 2D Cairo pentagonal lattice Quantum anomalous Hall effect 

分 类 号：TB34[一般工业技术—材料科学与工程]