Nonequilibrium magnons from hot electrons in antiferromagnetic systems
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/3089985Utgivelsesdato
2023Metadata
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- Institutt for fysikk [2790]
- Publikasjoner fra CRIStin - NTNU [39811]
Originalversjon
Physical Review Research (PRResearch). 2023, 5 (2), . 10.1103/PhysRevResearch.5.L022065Sammendrag
We describe a \emph{nonthermal} magnon activation mechanism in antiferromagnetic (AFM) systems via locally equilibrated \emph{spin-unpolarized} hot electrons excited by an ultrafast intense laser pulse. We employ a quantum kinetic equation that takes into account a direct electron-magnon scattering channel in either bulk AFM metal or at the interface of the AFM/normal-metal heterostructure. The mechanism is responsible for the nonequilibrium population of AFM magnon modes on a subnanosecond timescale, which are formed shortly after quasithermalization of hot electrons by Coulomb interactions. Nonequilibrium magnon populations can be additionally manipulated by applying an external magnetic field. Our work paves the way toward spin dynamics control in AFM systems via the ultrafast manipulation of out-of-equilibrium magnon excitations. Nonequilibrium magnons from hot electrons in antiferromagnetic systems