Nodal magnon spin current at an antiferromagnet/altermagnet junction
Abstract
We investigate the thermally driven magnon spin current across a junction between a d-wave altermagnet (AM) and a ferromagnet (FM) or an antiferromagnet (AFM). The current consists of a component independent of the interface angle and an angularly dependent component with the d-wave form. For a sublattice-symmetric interface, the two junctions behave oppositely under reversal of the altermagnetic domain: in the FM/AM junction the angularly dependent component is odd and cancels on averaging over the domains, whereas in the AFM/AM junction the angularly independent component vanishes by symmetry and the angularly dependent component survives the domain average at a fixed Néel vector of the AFM. Both follow from a selective tunneling: a pair of spins bonded across the interface transmits magnons when the spins are parallel and not when antiparallel, which makes the AFM/AM junction a magnon valve: the configuration in which the bonded spins are antiparallel blocks the current up to the sublattice admixture of the magnons. The anisotropic tunneling is detectable as the sign reversal of the current between the interfaces normal to [310] and [130], and the valve reads the Néel vector of the altermagnet relative to that of the antiferromagnet through the magnitude of the current at a fixed interface.
Related
- Equal-Spin local and nonlocal Andreev reflection in altermagnet/superconductor/altermagnet junction
- Coherent terahertz magnon-phonon three-wave mixing in a layered antiferromagnet
- Odd-parity magnon spin polarization from chiral four-spin exchange in a honeycomb antiferromagnet
- Tunable Ultrastrong Magnon-Magnon Coupling and Squeezed States in a Triaxial Van der Waals Antiferromagnet
- Temperature Evolution of Magnon-Polarons in the van der Waals Antiferromagnet FePS3
BibTeX
@misc{mizuno2026nodal,
title = {{Nodal magnon spin current at an antiferromagnet/altermagnet junction}},
author = {Koki Mizuno},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.39206},
eprint = {2610.39206},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.39206},
}
RIS
TY - UNPB
TI - Nodal magnon spin current at an antiferromagnet/altermagnet junction
AU - Koki Mizuno
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.39206
UR - https://arxiv.org/abs/2610.39206
AB - We investigate the thermally driven magnon spin current across a junction between a d-wave altermagnet (AM) and a ferromagnet (FM) or an antiferromagnet (AFM). The current consists of a component independent of the interface angle and an angularly dependent component with the d-wave form. For a sublattice-symmetric interface, the two junctions behave oppositely under reversal of the altermagnetic domain: in the FM/AM junction the angularly dependent component is odd and cancels on averaging over the domains, whereas in the AFM/AM junction the angularly independent component vanishes by symmetry and the angularly dependent component survives the domain average at a fixed Néel vector of the AFM. Both follow from a selective tunneling: a pair of spins bonded across the interface transmits magnons when the spins are parallel and not when antiparallel, which makes the AFM/AM junction a magnon valve: the configuration in which the bonded spins are antiparallel blocks the current up to the sublattice admixture of the magnons. The anisotropic tunneling is detectable as the sign reversal of the current between the interfaces normal to [310] and [130], and the valve reads the Néel vector of the altermagnet relative to that of the antiferromagnet through the magnitude of the current at a fixed interface.
ER -