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Signatures of coupling between spin waves and Dirac fermions in YbMnBi2
- Source :
- Physical Review B. 101
- Publication Year :
- 2020
- Publisher :
- American Physical Society (APS), 2020.
-
Abstract
- We present inelastic neutron scattering (INS) measurements of magnetic excitations in YbMnBi$_2$, which reveal features consistent with a direct coupling of magnetic excitations to Dirac fermions. In contrast with the large broadening of magnetic spectra observed in antiferromagnetic metals such as the iron pnictides, here the spin waves exhibit a small but resolvable intrinsic width, consistent with our theoretical analysis. The subtle manifestation of spin-fermion coupling is a consequence of the Dirac nature of the conduction electrons, including the vanishing density of states near the Dirac points. Accounting for the Dirac fermion dispersion specific to \ymb\ leads to particular signatures, such as the nearly wave-vector independent damping observed in the experiment.<br />Comment: 8 pages, 11 figures including both main text and supplemental material
- Subjects :
- Physics
Condensed Matter - Materials Science
Strongly Correlated Electrons (cond-mat.str-el)
Condensed matter physics
High Energy Physics::Lattice
Dirac (software)
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
02 engineering and technology
Electron
021001 nanoscience & nanotechnology
Coupling (probability)
01 natural sciences
Inelastic neutron scattering
Condensed Matter - Strongly Correlated Electrons
symbols.namesake
Dirac fermion
Spin wave
0103 physical sciences
symbols
Density of states
Antiferromagnetism
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 101
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....8e1b61347c742d333b18752eea2ddb0c