Dirac nodal line magnons in layered honeycomb antiferromagnets.
We show the existence of three-dimensional (3D) Dirac nodal line (DNL) magnons in layered honeycomb antiferromagnets. In stark contrast to 3D ferromagnets, the present DNL magnons are robust against the Dzyaloshinskii-Moriya interaction. They exhibit small dispersive drumhead magnon surface states that connect a pair of surface projection of the DNL magnons, and are topologically protected by magnetic crystal symmetry.
Publisher URL: http://arxiv.org/abs/1801.03498
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