Weyl magnons in pyrochlore antiferromagnets with all-in-all-out orders
| Autor: | Wenxing Nie, Shao-Kai Jian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Pyrochlore
FOS: Physical sciences 02 engineering and technology engineering.material 01 natural sciences Condensed Matter::Materials Science Condensed Matter - Strongly Correlated Electrons Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Quantum Physics Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Magnetic order Magnon Materials Science (cond-mat.mtrl-sci) Order (ring theory) 021001 nanoscience & nanotechnology Symmetry (physics) Magnetic field Magnet engineering Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Popis: | We investigate novel topological magnon band crossings of pyrochlore antiferromagnets with all-in-all-out (AIAO) magnetic order. By general symmetry analysis and spin-wave theory, we show that pyrochlore materials with AIAO orders can host Weyl magnons under external magnetic fields or uniaxial strains. Under a small magnetic field, the magnon bands of the pyrochlore with AIAO background can feature two opposite-charged Weyl points, which is the minimal number of Weyl points realizable in quantum materials and has not be experimentally observed so far. We further show that breathing pyrochlores with AIAO orders can exhibit Weyl magnons upon uniaxial strains. These findings apply to any pyrochlore material supporting AIAO orders, irrespective of the forms of interactions. Specifically, we show that the Weyl magnons are robust against direct (positive) Dzyaloshinskii-Moriya interactions. Because of the ubiquitous AIAO orders in pyrochlore magnets including R$_2$Ir$_2$O$_7$, and experimentally achievable external strain and magnetic field, our predictions provide promising arena to witness the Weyl magnons in quantum magnets. 5 pages+supplemental materials, 6 figures |
| Databáze: | OpenAIRE |
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