TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.4.125
TI  - Giant spatial anisotropy of magnon Landau damping in altermagnets
PY  - 2025/04/11
UR  - https://scipost.org/SciPostPhys.18.4.125
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 4
SP  - 125
A1  - Costa, António
AU  - Henriques, João C. G.
AU  - Fernández-Rossier, Joaquín
AB  - Altermagnets are a new class of magnetic materials with zero net magnetization (like antiferromagnets) but spin-split electronic bands (like ferromagnets) over a fraction of reciprocal space. As in antiferromagnets, magnons in altermagnets come in two flavours, that either add one or remove one unit of spin to the $S=0$ ground state. However, in altermagnets these two magnon modes are non-degenerate along some directions in reciprocal space. Here we show that the lifetime of altermagnetic magnons, due to Landau damping caused by coupling to Stoner modes, has a very strong dependence on both flavour and direction. Strikingly, coupling to Stoner modes leads to a complete suppression of magnon propagation along selected spatial directions. This giant anisotropy will impact electronic, spin, and energy transport properties and may be exploited in spintronic applications.
ER  -

@Article{10.21468/SciPostPhys.18.4.125,
	title={{Giant spatial anisotropy of magnon Landau damping in altermagnets}},
	author={António T. Costa and João C. G. Henriques and Joaquín Fernández-Rossier},
	journal={SciPost Phys.},
	volume={18},
	pages={125},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.4.125},
	url={https://scipost.org/10.21468/SciPostPhys.18.4.125},
}