残余交错磁性
Vestigial altermagnetism
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中文总结 AI 辅助
本文研究反铁磁与轨道序热熔化产生的残余交错磁性相，揭示其Q=0的独特序及一级/二级相变，并计算谱函数展示自旋轨道依赖的准粒子寿命特征。
中文摘要 AI 辅助
相互作用效应和涨落支配着具有多个竞争相系统的相图。特别是，当各个相因温度升高而被破坏时，涨落仍能产生由各个序参量乘积构成的复合“残余”序。在此，我们描述了在正方晶格上由反铁磁（AFM）和轨道序（OO）的热熔化产生的残余交错磁性（AM）。AFM和OO的共存可以产生具有序波矢$\mathbf{Q}=(\pi,\pi)$的常规AM。我们表明，AFM和OO的热熔化可以产生具有$\mathbf{Q}=0$的独特“残余AM”相，并研究了其通用相图。我们发现，从高温无序相到残余AM相的转变可以是一级或二级的，具体取决于AFM和OO的裸磁化率及其相互作用。然后，我们通过计算最小双轨道模型的电子谱函数来研究独特的实验特征。尽管残余AM序参量不直接与电子耦合，但涨落主导自能修正，产生具有AM对称性的自旋和轨道相关的准粒子寿命。
英文摘要
Interaction effects and fluctuations govern the phase diagram of systems with multiple competing phases. In particular, as individual phases are destroyed by increasing temperature, fluctuations can still produce a composite `vestigial' order given by a product of individual order parameters. Here, we describe vestigial Altermagnetism (AM) from the thermal melting of antiferromagnetic (AFM) and orbital orders (OO) on the square lattice. The coexistence of AFM and OO can give rise to conventional AM with ordering wave vector $\mathbf{Q}=(π,π)$. We show that a distinct `vestigial AM' phase with $\mathbf{Q}=0$ can arise from thermal melting of AFM and OO, and investigate its generic phase diagram. We find that the transition from the high-temperature disordered phase into the vestigial AM phase can be either first or second order, depending on the AFM and OO bare susceptibilities and their interactions. We then investigate the unique experimental signatures by calculating the electron spectral function for a minimal two-orbital model. Despite the fact that the vestigial AM order parameter does not couple to electrons directly, fluctuations dominate the self-energy corrections giving rise to a spin- and orbital-dependent quasi-particle lifetime with the AM symmetry.
发表机构
- Technical University of Munich（慕尼黑工业大学）
- TUM School of Natural Sciences（TUM自然科学学院）
- Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）
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