Nonequilibrium magnons from hot electrons in antiferromagnetic systems

被引：5

作者：

Barbeau, Marion M. S. ^{[1
]}

Titov, Mikhail ^{[2
]}

Katsnelson, Mikhail I. ^{[2
]}

Qaiumzadeh, Alireza ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, N-7491 Trondheim, Norway

[2] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands

来源：

PHYSICAL REVIEW RESEARCH | 2023年 / 5卷 / 02期

关键词：

BOLTZMANN EQUATIONS;

D O I：

10.1103/PhysRevResearch.5.L022065

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We describe a nonthermal magnon activation mechanism in antiferromagnetic (AFM) systems via locally equilibrated 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.

引用

页数：6

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