Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets

S. A. Owerre

doi:10.1038/s41598-017-07276-8

paper

Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets

arXiv:1703.07783 · doi:10.1038/s41598-017-07276-8

Abstract

In this report, we propose a new concept of one-dimensional (1D) closed lines of Dirac magnon nodes in two-dimensional (2D) momentum space of quasi-2D quantum magnetic systems. They are termed "2D Dirac magnon nodal-line loops". We utilize the bilayer honeycomb ferromagnets with intralayer coupling $J$ and interlayer coupling $J_{L}$ , which is realizable in the honeycomb chromium compounds CrX $_{3}$ (X $\equiv$ Br, Cl, and I). However, our results can also exist in other layered quasi-2D quantum magnetic systems. Here, we show that the magnon bands of the bilayer honeycomb ferromagnets overlap for $J_{L} \neq = 0$ and form 1D closed lines of Dirac magnon nodes in 2D momentum space. The 2D Dirac magnon nodal-line loops are topologically protected by inversion and time-reversal symmetry. Furthermore, we show that they are robust against weak Dzyaloshinskii-Moriya interaction $Δ_{D M} < J_{L}$ and possess chiral magnon edge modes.}

10 pages, 7 figures. Accepted to Scientific Reports

Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets

Abstract

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