Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets
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...
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Veröffentlicht in: | Scientific reports 2017-07, Vol.7 (1), p.6931-9, Article 6931 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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 ≡ 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
≠ 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
DM
|
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-017-07276-8 |