Theory of magnetism in the van der Waals magnet CrI3
| Autor: | Alvaro S. Nunez, R. Jaeschke-Ubiergo, E. Suárez Morell |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Materials Science Chern class Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Magnetism Skyrmion Magnon Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Ferromagnetism Lattice (order) 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Condensed Matter::Strongly Correlated Electrons van der Waals force 010306 general physics 0210 nano-technology Anisotropy |
| DOI: | 10.48550/arxiv.2012.03099 |
| Popis: | We study the microscopical origin of anisotropic ferromagnetism in the van der Waals magnet CrI3. We conclude that the nearest neighbors exchange is well described by the Heisenberg-Kitaev-Gamma (HKGamma) model, and we also found a nonzero Dzyaloshinskii-Moriya interaction (DMI) on next nearest neighbors. Both Kitaev and DMI are known to generate a non-trivial topology of the magnons in the honeycomb lattice and have been used separately to describe the low energy regime of this material. We discuss that including one or the other leads to different signs of the Chern number. Furthermore, the topological gap at K-point seems to be mainly produced by DMI, despite it is one order of magnitude smaller than Kitaev. Finally, we show that by applying an external electric field perpendicular to the crystal plane, it is possible to induce DMI on nearest neighbors, and this could have consequences in non-collinear spin textures, such as domain walls and skyrmions. Comment: Submitted to Physical Review B. 13 pages and 7 figures; Added references in section II.C |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|