CrSb中自旋-晶格耦合增强的关联交错磁
Correlation enhanced altermagnetism mediated by spin-lattice coupling in CrSb
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中文总结 AI 辅助
本研究通过DFT、DFT+$U$和DMFT计算，发现电子关联和自旋-晶格耦合显著增强CrSb及MnTe等NiAs型材料的交错磁自旋劈裂，提出SLC作为调控交错磁强度的微观描述符。
中文摘要 AI 辅助
交错磁体（AMs）表现出无净磁化的动量依赖自旋劈裂，使其成为自旋电子学应用的有前景平台。虽然非相对论性交错磁自旋劈裂（NRASS）的对称性和多极起源已得到充分确立，但电子关联和自旋-晶格耦合（SLC）在控制NRASS中的作用仍未探索。特别是，SLC通过晶格自由度提供了调控交错磁性的直接途径。在此，我们首先利用密度泛函理论（DFT）、DFT+$U$和动力学平均场理论（DMFT）研究电子关联对NiAs型材料CrSb中交错磁强度的影响。我们发现，增强的电子关联显著增强NRASS，并驱动一个不相称的自旋螺旋（SS）态稳定化，而动力学关联通过Cr-$3d$态的准粒子重整化进一步放大自旋劈裂。我们发现，在DFT+DMFT中NRASS比在DFT中大12.5%。通过下一步评估SLC，我们建立了其与NRASS演化的直接联系，并确定SLC为CrSb中电子关联与增强交错磁之间的微观描述符。在另一种NiAs型化合物MnTe中研究它，我们表明SLC-NRASS相关性在AMs中是普遍的，并将SLC确立为交错磁强度的微观描述符。我们的结果为通过电子关联与晶格自由度之间的相互作用调控交错磁性提供了一个统一框架。
英文摘要
Altermagnets (AMs) exhibit momentum-dependent spin splitting without net magnetization, making them promising platforms for spintronic applications. While the symmetry and multipolar origins of nonrelativistic altermagnetic spin splitting (NRASS) are well established, the role of electronic correlations and spin-lattice coupling (SLC) in controlling NRASS remain unexplored. In particular, SLC provides a direct pathway for tuning altermagnetism through lattice degrees of freedom. Here we first investigate the role of electronic correlations on altermagnetic strength in NiAs-type material CrSb using density functional theory (DFT), DFT+$U$, and dynamical mean-field theory (DMFT). We find that increasing electronic correlations substantially enhance NRASS and drive the stabilization of an incommensurate spin-spiral (SS) state, while dynamical correlations further amplify the spin splitting through quasiparticle renormalization of the Cr-$3d$ states. We find that the NRASS remains 12.5\% larger in DFT+DMFT than in DFT. By evaluating SLC in next step, we establish its direct connection to the evolution of NRASS and identify SLC as a microscopic descriptor between electronic correlation and enhanced altermagnetism in CrSb. Investigating it in another NiAs-type compound MnTe, we show that the SLC-NRASS correlation is generic across AMs and establish SLC as a microscopic descriptor of altermagnetic strength. Our results provide a unified framework for tuning altermagnetism through the interplay between the electronic correlations and lattice degrees of freedom.
发表机构
- École Centrale School of Engineering, Mahindra University（马欣德拉大学中央工程学院）
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