LiNiPO$_4$中的反对称康普顿散射：迈向磁电多极矩的直接探测
Anti-symmetric Compton scattering in LiNiPO$_4$: Towards a direct probe of the magneto-electric multipole moment
AI总结：
本文通过密度泛函理论计算与实验测量，研究了LiNiPO$_4$中反对称康普顿轮廓作为磁电环向矩探针的可行性，发现信号与计算一致但量级接近实验误差，为寻找更大效应材料提供了方向。
摘要：
我们提出了一项结合理论与实验的研究，探讨LiNiPO$_4$中反对称康普顿轮廓作为磁电环向矩可能探针的可行性。理解并探测此类磁电多极矩是凝聚态物理中一个活跃的研究领域。我们基于密度泛函理论的计算表明，在动量空间中沿$t_y$环向矩方向存在反对称康普顿轮廓，计算得到的反对称轮廓比总轮廓小约四个数量级。我们测量到的差异信号与计算轮廓一致，但其量级与实验的统计误差和系统不确定度相当。我们的结果为进一步的理论工作提供了动力，以理解影响反对称康普顿轮廓大小的因素，并寻找表现出更大效应的材料。
英文摘要：
We present a combined theoretical and experimental investigation of the anti-symmetric Compton profile in LiNiPO$_4$ as a possible probe for magneto-electric toroidal moments. Understanding as well as detecting such magneto-electric multipoles is an active area of research in condensed matter physics. Our calculations, based on density functional theory, indicate an anti-symmetric Compton profile in the direction of the $t_y$ toroidal moment in momentum space, with the computed anti-symmetric profile around four orders of magnitude smaller than the total profile. The difference signal that we measure is consistent with the computed profile, but of the same order of magnitude as the statistical errors and systematic uncertainties of the experiment. Our results motivate further theoretical work to understand the factors that influence the size of the anti-symmetric Compton profile, and to identify materials exhibiting larger effects.
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