通过量子振荡诊断交变磁相
Diagnosing Altermagnetic Phases through Quantum Oscillations
AI总结：
本文通过费米学研究证明金属交变磁体的共线自旋劈裂费米面特征可由量子振荡测量揭示，横向塞曼场诱导Lifshitz转变并导致Shubnikov-de Haas振荡频率劈裂或合并，为诊断交变磁相提供了独特且普适的实验判据。
摘要：
最近被界定的交变磁相具有零净磁化强度但动量依赖的共线自旋劈裂特征。为了探索交变磁体引人入胜的物理效应和潜在应用，分析其费米面性质（包括构型和自旋纹理）至关重要。在此，我们对金属交变磁体进行了费米学研究，并证明其费米面的共线自旋劈裂特征可以通过量子振荡测量清晰地揭示出来。通过引入横向塞曼场以消除动量空间中的自旋简并线，费米面经历Lifshitz转变，从而在具有相反自旋的轨道之间产生自旋翻转的回旋运动。相应地，Lifshitz-Onsager量子化产生两组朗道能级，导致电导率中Shubnikov-de Haas振荡的频率劈裂。在存在自旋轨道耦合的情况下，塞曼场使两个独立的回旋轨道在Lifshitz转变点处合并，随后再次劈裂。这导致两个原始频率不连续地变为一个等于它们之和的单一频率。我们的工作揭示了一种独特且普适的交变磁费米面特征，该特征可以通过量子振荡测量进行探测。
英文摘要：
The recently delimited altermagnetic phase is characterized by zero net magnetization but momentum-dependent collinear spin-splitting. To explore the intriguing physical effects and potential applications of altermagnets, it is essential to analyze their Fermi surface properties, encompassing both configurations and spin textures. Here, we conduct a Fermiology study on metallic altermagnets and demonstrate that the collinear spin-split features of their Fermi surfaces can be clearly revealed through quantum oscillation measurements. By introducing a transverse Zeeman field to remove the spin-degenerate lines in the momentum space, the Fermi surface undergoes a Lifshitz transition, giving rise to spin-flipped cyclotron motion between orbits with opposite spins. Accordingly, the Lifshitz-Onsager quantization yields two sets of Landau levels, leading to frequency splitting of the Shubnikov-de Haas oscillations in conductivity. In the presence of spin-orbit coupling, the Zeeman field causes two separate cyclotron orbits to merge at the Lifshitz transition point before splitting again. This results in the two original frequencies discontinuously changing into a single frequency equal to their sum. Our work unveils a unique and universal signature of altermagnetic Fermi surfaces that can be probed through quantum oscillation measurements.
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