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Journal Article
Dirac fermions in an antiferromagnetic semimetal
2016
Overview
The prediction of an antiferromagnetic semimetal that breaks both time-reversal and inversion symmetry but respects their combination could provide a platform for studying the interplay between Dirac fermions and magnetism.
Analogues of the elementary particles have been extensively searched for in condensed-matter systems for both scientific interest and technological applications
1
,
2
,
3
. Recently, massless Dirac fermions were found to emerge as low-energy excitations in materials now known as Dirac semimetals
4
,
5
,
6
. All of the currently known Dirac semimetals are non-magnetic with both time-reversal symmetry
and inversion symmetry
7
,
8
,
9
. Here we show that Dirac fermions can exist in one type of antiferromagnetic system, where both
and
are broken but their combination
is respected. We propose orthorhombic antiferromagnet CuMnAs as a candidate, analyse the robustness of the Dirac points under symmetry protections and demonstrate its distinctive bulk dispersions, as well as the corresponding surface states, by
ab initio
calculations. Our results provide a possible platform to study the interplay of Dirac fermion physics and magnetism.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Publishing Group (NPG)
