空穴掺杂RuO₂中交替磁性的量子振荡指纹
Quantum oscillation fingerprints of altermagnetism in hole-doped RuO2
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中文总结 AI 辅助
研究空穴掺杂RuO₂中交替磁性，基于第一性原理计算利用量子振荡，发现空穴掺杂增强自旋分裂、重构费米面，确定Ru磁矩与自旋分裂特征的准线性关联，还揭示其态转变及相关特征，为理解该材料提供框架。
中文摘要 AI 辅助
交替磁性因其类似铁磁性的自旋分裂能带结构和类似反铁磁性的磁序而备受关注。空穴掺杂可能促进有争议的交替磁性候选材料RuO₂的磁性，但其电子和磁性性质在空穴掺杂下的演变仍不清楚。基于第一性原理计算，利用量子振荡研究空穴掺杂的RuO₂。发现空穴掺杂可增强自旋分裂并重构费米面，通过追踪一对封闭费米面口袋，确定了Ru磁矩与基于量子振荡的自旋分裂特征之间的有意义关联，该关联在宽掺杂范围内呈准线性趋势，可由最小二维d波交替磁模型捕获。此外，空穴掺杂的RuO₂通过中间态从非磁性转变为交替磁性态。通过量子振荡的准线性关联和稳定交替磁性态独特的量子振荡频率可作为识别RuO₂中交替磁性态的有用特征。结果为理解空穴掺杂RuO₂提供了全面框架，为交替磁性转变及其识别提供了新见解。
英文摘要
Altermagnetism, characterized by its ferromagnetism-like spin-splitting band structure and antiferromagnetism-like magnetic order, has garnered considerable attention recently. Although hole doping may promote magnetism in the debated altermagnet candidate RuO2, the evolution of its electronic and magnetic properties under hole doping remains poorly understood. Based on first-principles calculations, we employ quantum oscillations to study hole-doped RuO2. We find that hole doping can enhance spin splitting and reconstruct the Fermi surface in RuO2, which is revealed by the angle-dependent quantum oscillation frequency. By tracking a pair of closed Fermi-surface pockets, we identify a meaningful correlation between the magnetic moment of Ru and a quantum-oscillation-based signature of spin splitting. This correlation follows a quasi-linear trend over a broad doping range, which can be captured by a minimal two-dimensional d-wave altermagnetic model. In addition, the hole-doped RuO2 exhibits a transition from a nonmagnetic to an altermagnetic state via an intermediate state. The quasi-linear correlation through quantum oscillation and the distinct quantum oscillation frequency of the stable altermagnetic state can serve as useful signatures for identifying the altermagnetic state in RuO2. Our results provide a comprehensive framework for understanding hole-doped RuO2, offering new insights into altermagnetic transitions and their identification.
