Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets
The rich and unconventional physics in layered 2D magnets can open new avenues for topological magnonics and magnon valleytronics. In particular, two-dimensional (2D) bilayer quantum magnets are gaining increasing attention due to their intriguing stacking-dependent magnetism, controllable ground st...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/abfa62 |
| _version_ | 1797750162547802112 |
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| author | Doried Ghader |
| author_facet | Doried Ghader |
| author_sort | Doried Ghader |
| collection | DOAJ |
| description | The rich and unconventional physics in layered 2D magnets can open new avenues for topological magnonics and magnon valleytronics. In particular, two-dimensional (2D) bilayer quantum magnets are gaining increasing attention due to their intriguing stacking-dependent magnetism, controllable ground states, and topological excitations induced by magnetic spin–orbit couplings (SOCs). Despite the substantial research on these materials, their topological features remain widely unexplored to date. The present study comprehensively investigates the magnon topology and magnon valley-polarization in honeycomb bilayers with collinear magnetic order. We elucidate the separate and combined effects of the SOC, magnetic ground-states, stacking order, and inversion symmetry breaking on the topological phases, magnon valley transport, and the Hall and Nernst effects. The comprehensive analysis suggests clues to determine the SOC’s nature and predicts unconventional Hall and Nernst conductivities in topologically trivial phases. We further report on novel bandgap closures in layered antiferromagnets and detail their topological implications. We believe the present study provides important insights into the fundamental physics and technological potentials of topological 2D magnons. |
| first_indexed | 2024-03-12T16:29:41Z |
| format | Article |
| id | doaj.art-af347d5ad2754c8e9ba95a396639f41a |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:29:41Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-af347d5ad2754c8e9ba95a396639f41a2023-08-08T15:34:19ZengIOP PublishingNew Journal of Physics1367-26302021-01-0123505302210.1088/1367-2630/abfa62Insights on magnon topology and valley-polarization in 2D bilayer quantum magnetsDoried Ghader0https://orcid.org/0000-0002-2054-1950College of Engineering and Technology, American University of the Middle East , Egaila, KuwaitThe rich and unconventional physics in layered 2D magnets can open new avenues for topological magnonics and magnon valleytronics. In particular, two-dimensional (2D) bilayer quantum magnets are gaining increasing attention due to their intriguing stacking-dependent magnetism, controllable ground states, and topological excitations induced by magnetic spin–orbit couplings (SOCs). Despite the substantial research on these materials, their topological features remain widely unexplored to date. The present study comprehensively investigates the magnon topology and magnon valley-polarization in honeycomb bilayers with collinear magnetic order. We elucidate the separate and combined effects of the SOC, magnetic ground-states, stacking order, and inversion symmetry breaking on the topological phases, magnon valley transport, and the Hall and Nernst effects. The comprehensive analysis suggests clues to determine the SOC’s nature and predicts unconventional Hall and Nernst conductivities in topologically trivial phases. We further report on novel bandgap closures in layered antiferromagnets and detail their topological implications. We believe the present study provides important insights into the fundamental physics and technological potentials of topological 2D magnons.https://doi.org/10.1088/1367-2630/abfa622D topological magnetstopological phase transitionsmagnon valleytronicsKitaev interactionDzyaloshinskii–Moriya interactionmagnon Hall conductivity |
| spellingShingle | Doried Ghader Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets New Journal of Physics 2D topological magnets topological phase transitions magnon valleytronics Kitaev interaction Dzyaloshinskii–Moriya interaction magnon Hall conductivity |
| title | Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets |
| title_full | Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets |
| title_fullStr | Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets |
| title_full_unstemmed | Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets |
| title_short | Insights on magnon topology and valley-polarization in 2D bilayer quantum magnets |
| title_sort | insights on magnon topology and valley polarization in 2d bilayer quantum magnets |
| topic | 2D topological magnets topological phase transitions magnon valleytronics Kitaev interaction Dzyaloshinskii–Moriya interaction magnon Hall conductivity |
| url | https://doi.org/10.1088/1367-2630/abfa62 |
| work_keys_str_mv | AT doriedghader insightsonmagnontopologyandvalleypolarizationin2dbilayerquantummagnets |