Skyrmion Hall Effect in Altermagnets

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Zhejunyu Jin, Zhaozhuo Zeng, Yunshan Cao, Peng Yan
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引用次数: 0

Abstract

It is widely believed that the skyrmion Hall effect is absent in antiferromagnets because of the vanishing topological charge. However, the Aharonov-Casher theory indicates the possibility of topological effects for neutral particles. In this Letter, we predict the skyrmion Hall effect in emerging altermagnets with zero net magnetization and zero skyrmion charge. We first show that the neutral skyrmion manifests as a magnetic quadrupole in altermagnets. We reveal a hidden gauge field from the magnetic quadrupole, which induces the skyrmion Hall effect when driven by spin transfer torque. Interestingly, we identify a sign change of the Hall angle when one swaps the anisotropic exchange couplings in altermagnets. Furthermore, we demonstrate that both the velocity and Hall angle of altermagnetic skyrmions sensitively depend on the current direction. Our findings real the critical role of magnetic quadrupole in driving the skyrmion Hall effect with vanishing charge, and pave the way to discovering new Hall effect of neutral quasiparticles beyond magnetic skyrmions.
反向磁体中的 Skyrmion 霍尔效应
人们普遍认为,由于拓扑电荷的消失,反铁磁体中不存在天电荷霍尔效应。然而,Aharonov-Casher 理论表明,中性粒子可能存在拓扑效应。在这封信中,我们预测了净磁化为零和天磁电荷为零的新兴反铁磁体中的天磁霍尔效应。我们首先证明了中性天电荷在改变磁体中表现为磁四极。我们揭示了来自磁四极的隐藏规场,它在自旋传递力矩的驱动下诱发了天电荷霍尔效应。有趣的是,我们发现当交换各向异性交换耦合时,霍尔角的符号会发生变化。此外,我们还证明了改磁天体的速度和霍尔角都敏感地取决于电流方向。我们的发现真正揭示了磁四极在驱动电荷消失的天幕霍尔效应中的关键作用,并为发现磁天幕之外的中性准粒子的新霍尔效应铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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