作为Floquet共线磁体中自旋劈裂与奇宇称性质探针的RKKY相互作用
RKKY interaction as a probe of valley-dependent spin splitting and odd-parity nature in Floquet collinear magnets
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中文总结 AI 辅助
本文提出RKKY相互作用可作为探针，通过检测共线奇宇称磁体的自旋劈裂与奇宇称自旋极化，实现对这类磁体的区分与性质确认，相关预测可由现有实验技术验证。
中文摘要 AI 辅助
奇宇称磁体近期被提出可通过Floquet工程在共线反铁磁体（AFMs）中实现，其奇宇称自旋极化依赖于谷相关的自旋劈裂。该提出带来两个关键挑战：检测自旋劈裂以验证这类磁体的产生机制，以及识别这类极化以确认奇宇称性质。本文中，我们证明Ruderman-Kittel-Kasuya-Yosida（RKKY）相互作用可作为完成这两项任务的统一磁探针。以共线f波磁体为代表示例，我们发现RKKY相互作用能产生自旋劈裂的独特磁信号，包括海森堡/伊辛项的磁性反转和Dzyaloshinskii-Moriya（DM）项的符号交替，可清晰区分共线f波磁体与其他相关反铁磁体。此外，DM项呈现具有奇宇称对称性的f波形状，满足J^αβ_DM(R) = -J^αβ_DM(C_{2q}R)（q=3），直接反映动量空间中的奇宇称自旋极化S_z(k) = -S_z(C_{2q}k)。该行为在p波磁体（q=1）中同样存在，证明了我们方法的普适性。本研究确立RKKY相互作用作为检测共线奇宇称磁体能带特征的多功能探针，其预测可通过自旋极化扫描隧道谱等现有实验技术实现。
英文摘要
Odd-parity magnets were recently proposed to emerge in collinear antiferromagnets (AFMs) via Floquet engineering, with valley-dependent spin splitting underlying the odd-parity spin polarization. This proposal brings about two key challenges: detecting the spin splitting to verify the generation mechanism of these magnets, and identifying such polarization to confirm the odd-parity nature. Here, we show that the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction provides a unified magnetic probe for both tasks. Taking collinear $f$-wave magnets as a representative example, we find that the RKKY interaction yields distinct magnetic signals of the spin splitting---including a magnetism reversal in the Heisenberg/Ising terms and a sign alternation of the Dzyaloshinskii-Moriya (DM) term---that enable clear discrimination of collinear $f$-wave magnets from other related AFMs. Moreover, the DM term exhibits an $f$-wave shape with odd-parity symmetry, satisfying $J^{αβ}_{DM}(\mathbf{R}) = -J^{αβ}_{DM}(C_{2q}\mathbf{R})$ ($q=3$), which directly reflects the odd-parity spin polarization $S_z(\mathbf{k}) = -S_z(C_{2q}\mathbf{k})$ in momentum space. This behavior persists in $p$-wave magnets ($q=1$), demonstrating the generality of our approach. Our work establishes the RKKY interaction as a versatile probe for detecting band features of collinear odd-parity magnets, with predictions accessible to existing experimental techniques such as spin-polarized scanning tunneling spectroscopy.
