RuO$_2$中因接近Landau-Pomeranchuk不稳定性而产生的脆弱非常规磁性
Fragile Unconventional Magnetism in RuO$_2$ by Proximity to Landau-Pomeranchuk Instability
AI总结：
本文通过第一性原理计算证明RuO$_2$的交替磁性属于接近量子相变的非常规磁性，并指出Hubbard U、空穴掺杂和应变等参数对调制其费米面附近的准粒子相互作用具有关键作用。
摘要：
交替磁性因其自旋极化能带结构与零净磁化的显著结合而备受关注，成为自旋电子学应用的有力候选者。我们证明该磁相是“非常规磁性”的一个实例，该概念由本文作者之一在近二十年前首次提出，作为理解由多体相互作用驱动的自旋通道中Landau-Pomeranchuk不稳定性的更广泛框架的一部分。通过第一性原理计算系统分析RuO$_2$中的交替磁性，我们将相互矛盾的实验与理论报告协调起来，将其归因于RuO$_2$接近量子相变。我们强调了调节参数的关键作用，如Hubbard $U$、空穴掺杂和应变，在调制费米面附近的准粒子相互作用方面。本工作为RuO$_2$中交替磁性的起源与可调性提供了新见解，突出了其作为研究量子相变及更广泛非常规磁性领域的平台的潜力。
英文摘要：
Altermagnetism has attracted considerable attention for its remarkable combination of spin-polarized band structures and zero net magnetization, making it a promising candidate for spintronics applications. We demonstrate that this magnetic phase represents a case of ``unconventional magnetism," first proposed nearly two decades ago by one of the present authors as part of a broader framework for understanding Landau-Pomeranchuk instabilities in the spin channel, driven by many-body interactions. By systematically analyzing the altermagnetism in RuO$_2$ with first-principles calculations, we reconcile conflicting experimental and theoretical reports by attributing it to RuO$_2$'s proximity to a quantum phase transition. We emphasize the critical role of tuning parameters, such as the Hubbard $U$, hole doping, and epitaxial strain, in modulating quasiparticle interactions near the Fermi surface. This work provides fresh insights into the origin and tunability of altermagnetism in RuO$_2$, highlighting its potential as a platform for investigating quantum phase transitions and the broader realm of unconventional magnetism.
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