Indexed by: Journal paper

First Author: 徐刚

Correspondence Author: 方忠

Co-author: Gang Xu, Hongming Weng, Zhijun Wang, Xi Dai, Zhong Fang

Journal: Physical review letters

Included Journals: SCI

Discipline: Science

First-Level Discipline: Physics

Funded by: 973 program of China (No. 2007CB925000, No. 2011CBA00108).

Document Type: J

Volume: 107

Issue: 18

Page Number: 186806

Date of Publication: 2011-10-27

Abstract: 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.