论文类型：期刊论文
第一作者：徐刚
通讯作者：方忠
合写作者：Gang Xu, Hongming Weng, Zhijun Wang, Xi Dai, Zhong Fang
发表刊物：Physical review letters
收录刊物：SCI
学科门类：理学
一级学科：物理学
项目来源：973 program of China (No. 2007CB925000, No. 2011CBA00108).
文献类型：J
卷号：107
期号：18
页面范围：186806
发表时间：2011-10-27
摘要：In 3D momentum space, a topological phase boundary separating the Chern insulating layers from normal insulating layers may exist, where the gap must be closed, resulting in a “Chern semimetal” state with topologically unavoidable band crossings at the Fermi level. This state is a condensed-matter realization of Weyl fermions in (3+ 1) D, and should exhibit remarkable features, such as magnetic monopoles and Fermi arcs. Here we predict, based on first principles calculations, that such a novel quantum state can be realized in a known ferromagnetic compound HgCr 2 Se 4.