Emergent Skyrmion Hall Effect in d-wave Altermagnets at Finite Temperature
Abstract
Altermagnets combine compensated magnetic order with unconventional symmetry-dependent responses, offering a promising platform for spintronic applications. Here, we show that a voltage-controlled magnetic-anisotropy gradient drives altermagnetic (ATM) skyrmions in a nearly rectilinear, Hall-free manner in the absence of thermal fluctuations, owing to their strongly compensated gyrotropic response. Thermal magnons qualitatively modify this behavior by increasing the longitudinal drag through magnon--skyrmion scattering and generating a transverse reaction force through handedness-dependent skew scattering. Owing to the anisotropic altermagnetic magnon band structure, the relative transport weights of the two magnon handednesses are interchanged between propagation along the x and y directions, resulting in transverse skyrmion drifts of opposite sign. By contrast, along the high-symmetry direction, the two magnon handednesses remain degenerate and their transverse contributions cancel, preserving Hall-free motion even at finite temperature. We thus uncover a thermally emergent anisotropic skyrmion Hall effect whose direction-dependent magnitude and sign originate from the intrinsic symmetry-dependent magnon spectrum, making it a generic finite-temperature dynamical feature of ATM skyrmions. Our results establish a low-power route toward electrically controlled and thermally tunable ATM skyrmion transport.
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BibTeX
@misc{liu2026emergent,
title = {{Emergent Skyrmion Hall Effect in $d$-wave Altermagnets at Finite Temperature}},
author = {Tingting Liu and Bingyu Sun and Fengyue Zhu and Zhihui Zhang and Peiyu Zhang and Yang Liu and Minghui Qin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.27107},
eprint = {2608.27107},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.27107},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Emergent Skyrmion Hall Effect in d-wave Altermagnets at Finite Temperature
AU - Tingting Liu
AU - Bingyu Sun
AU - Fengyue Zhu
AU - Zhihui Zhang
AU - Peiyu Zhang
AU - Yang Liu
AU - Minghui Qin
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2608.27107
UR - https://arxiv.org/abs/2608.27107
AB - Altermagnets combine compensated magnetic order with unconventional symmetry-dependent responses, offering a promising platform for spintronic applications. Here, we show that a voltage-controlled magnetic-anisotropy gradient drives altermagnetic (ATM) skyrmions in a nearly rectilinear, Hall-free manner in the absence of thermal fluctuations, owing to their strongly compensated gyrotropic response. Thermal magnons qualitatively modify this behavior by increasing the longitudinal drag through magnon--skyrmion scattering and generating a transverse reaction force through handedness-dependent skew scattering. Owing to the anisotropic altermagnetic magnon band structure, the relative transport weights of the two magnon handednesses are interchanged between propagation along the x and y directions, resulting in transverse skyrmion drifts of opposite sign. By contrast, along the high-symmetry direction, the two magnon handednesses remain degenerate and their transverse contributions cancel, preserving Hall-free motion even at finite temperature. We thus uncover a thermally emergent anisotropic skyrmion Hall effect whose direction-dependent magnitude and sign originate from the intrinsic symmetry-dependent magnon spectrum, making it a generic finite-temperature dynamical feature of ATM skyrmions. Our results establish a low-power route toward electrically controlled and thermally tunable ATM skyrmion transport.
ER -