Multiple Dirac cones and topological magnetism in honeycomb-monolayer transition metal trichalcogenides

被引:24
|
作者
Sugita, Yusuke [1 ]
Miyake, Takashi [2 ]
Motome, Yukitoshi [1 ]
机构
[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan
[2] Natl Inst Adv Ind Sci & Technol, CD FMat, Tsukuba, Ibaraki 3058568, Japan
基金
日本学术振兴会;
关键词
CRYSTAL; PHASE;
D O I
10.1103/PhysRevB.97.035125
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The discovery of monolayer graphene has initiated two fertile fields in condensed matter physics: Dirac semimetals and atomically thin layered materials. When these trends meet again in transition metal compounds, which possess spin and orbital degrees of freedom and strong electron correlations, more exotic phenomena are expected to emerge in the cross section of topological states of matter and Mott physics. Here, we show by using ab initio calculations that a monolayer form of transition metal trichalcogenides (TMTs), which has a honeycomb network of 4d and 5d transition metal cations, may exhibit multiple Dirac cones in the electronic structure of the half-filled e(g) orbitals. The Dirac cones are gapped by the spin-orbit coupling under the trigonal lattice distortion and, hence, can be tuned by tensile strain. Furthermore, we show that electron correlations and carrier doping turn the multiple Dirac semimetal into a topological ferromagnet with high Chern number. Our findings indicate that the honeycomb-monolayer TMTs provide a good playground for correlated Dirac electrons and topologically nontrivial magnetism.
引用
收藏
页数:8
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