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arXiv · 1608.05791

A Family Group of Two-dimensional Node-Line Semimetals

Yuanjun Jin·Rui Wang·Jinzhu Zhao·Candi Zheng·Li-Yong. Gan·Junfeng Liu·Hu Xu·S. Y. Tong
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Abstract

Using evolutionary algorithm and first-principles calculations, we predict a family group of two-dimensional node-line semimetals MX (M=Pd, Pt; X=S, Se, Te), which has zig-zag type mono-layer structure in Pmm2 layer group. Band structure analysis reveals that node-line features are caused by band inversion and the inversion exists even in the absence of spin-orbital-coupling. Tests are carried out to confirm that the node-line loop is protected by crystal symmetry. This work extends our knowledge of node-line materials to two-dimensional cases, i.e., a group of metal-group VI compounds sharing the same lattice structure which has time reversion and crystal-mirror inversion symmetries.

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Yuanjun Jin, Rui Wang, Jinzhu Zhao, Candi Zheng, Li-Yong. Gan, Junfeng Liu, Hu Xu, S. Y. Tong. 2016-08-20. A Family Group of Two-dimensional Node-Line Semimetals. https://doi.org/10.1039/c7nr03520a

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