发表机构
Zernike Institute for Advanced Materials, University of Groningen; Department of Physics, University of North Texas（格罗宁根大学泽尔尼克高级材料研究所; 北德克萨斯大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文从理论上证实铁轴向序会产生自旋霍尔效应等非常规响应，可区分铁轴向畴，还通过第一性原理计算揭示了含此类响应的铁性金属，为铁轴向序探测提供了新途径，拓展了铁性调控与器件设计的可能。
AI 中文摘要
铁轴向材料是一类新兴的铁性材料，与铁磁体和铁电体不同，它们对杂散场完全稳定，非常适合数据存储和其他非易失性应用。然而，铁轴向态的检测仍具挑战性，因为铁轴向性不会直接表现为可测量的宏观电极化或磁化，探测手段大多局限于光学方法。本文从理论上证实，铁轴向序会在广泛的线性和非线性输运、光学及平衡现象中，普遍产生对外界刺激响应的非常规分量，例如自旋霍尔效应、磁塞贝克效应或法拉第效应。这些非常规响应始终与铁轴向序直接耦合，可区分铁轴向畴，为铁轴向序提供探测手段。这种普遍关联还揭示了一类尚未充分探索的铁性金属，其中非常规输运为铁轴向序提供了天然探测方式，我们通过对代表性材料的第一性原理计算证实了这一点。研究结果揭示了铁性序表现形式的根本差异：铁轴向性主要体现为非常规材料响应，而非直接可测的序参量，拓宽了非易失性铁性调控和柔性器件设计的可能性。
英文摘要
Ferroaxial materials are an emerging class of ferroic materials that, in contrast to ferromagnets and ferroelectrics, are fully robust against stray fields, making them ideally suited for data storage and other nonvolatile applications. However, detection of the ferroaxial state remains challenging, as ferroaxiality does not manifest directly through a measurable macroscopic electric polarization or magnetization, and probes are mostly limited to optical methods. Here, we theoretically establish that ferroaxial order universally generates unconventional components of responses to external stimuli, such as the spin Hall effect, magneto-Seebeck effect, or Faraday effect, across a broad range of linear and nonlinear transport, optical and equilibrium phenomena. These unconventional responses are always directly coupled to ferroaxial order and can distinguish ferroaxial domains, providing probes of ferroaxial order. This general connection also reveals a largely unexplored class of ferroaxial metals, in which unconventional transport provides a natural probe of ferroaxial order, as demonstrated by our first-principles calculations for representative materials. Our results reveal a fundamentally different way for ferroic order to manifest -- ferroaxiality primarily shows unconventional material responses rather than the directly measurable order parameters, broadening the possibilities of nonvolatile ferroic control and flexible device design.
