Topological magnonics in the two-dimensional van der Waals magnet CrI3
| Autor: | R. Jaeschke-Ubiergo, Alvaro S. Nunez, Esteban Tapia Aguilera, N. Vidal-Silva, Luis E. F. Foa Torres |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Magnonics Condensed Matter - Materials Science Magnon Spectrum (functional analysis) Thermal Hall effect Isotropy Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences symbols.namesake Ferromagnetism 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons van der Waals force 010306 general physics 0210 nano-technology Anisotropy |
| Popis: | In this article, we calculate the magnon spectrum of Kitaev-Heisenberg magnets. This model has been recently proposed as a spin Hamiltonian to model $\text{CrI}_3$ and other two-dimensional magnets. It is a minimal spin Hamiltonian that includes a contribution stemming from a Heisenberg, isotropic exchange, and a contribution arising from a Kitaev interaction, anisotropic and frustrated exchange. Our calculations reveal the topological nature of the magnons and a gap that opens at the $K$ and $K^\prime$ points. These topological properties give rise to effects such as thermal Hall effect. In addition to the bulk properties, we calculate the magnon spectrum of nanoribbons illustrating the corresponding edge states. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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