B型二次平面霍尔效应作为交变磁序的探针

中文摘要 AI 辅助

传统的输运和光学响应，如霍尔效应，只能区分具有显著不同对称性的材料相。然而，许多量子材料，例如候选的交变磁材料，拥有结构相似的竞争相，这使得使用传统输运或光学测量难以区分它们。在此，受对称性原理的指导，我们引入了一种B型二次平面霍尔效应（B2-PHE），作为磁结构的灵敏探针。B2-PHE的特征在于平面霍尔电流随外加磁场呈二次方缩放。该响应源于外加磁场、内禀磁序以及电子带的量子几何性质之间的相互作用。我们研究了两种交变磁候选材料KV2Se2O和RuO2中的B2-PHE，它们的基态磁序正受到激烈争论。值得注意的是，B2-PHE在其交变磁相中出现，但在其反铁磁（非磁性）相中被对称性禁止。我们还表明，在约1特斯拉量级的适中磁场下，B2-PHE应该是可探测的。这些发现确立了B2-PHE作为一种实验上方便且可能无歧义的交变磁序探针，而这种磁序否则难以实现。

英文摘要

Conventional transport and optical responses, such as the Hall effect, can only distinguish material phases with substantially different symmetries. However, many quantum materials, such as candidate altermagnetic materials, host competing phases with similar structures, making it difficult to differentiate them using conventional transport or optical measurements. Here, guided by symmetry principles, we introduce a B-type quadratic planar Hall effect (B2-PHE) as a sensitive probe of magnetic structures. B2-PHE features a planar Hall current that scales quadratically with the applied magnetic field. This response originates from the interplay among external magnetic fields, intrinsic magnetic order, and quantum geometric properties of the electronic bands. We investigate B2-PHE in two altermagnetic candidates, KV2Se2O and RuO2, whose ground-state magnetic orders are under intense debate. Remarkably, B2-PHE emerges in their altermagnetic phases but is symmetry-forbidden in their antiferromagnetic (nonmagnetic) phases. We also show that B2-PHE should be detectable under a moderate magnetic field on the order of 1 Tesla. These findings establish B2-PHE as an experimentally convenient and potentially unambiguous probe of altermagnetic order, which is otherwise difficult to realize.

发表机构

• City University of Hong Kong（香港城市大学）
• The Hong Kong University of Science and Technology（香港科技大学）
• Xi’an Jiaotong University（西安交通大学）

机构由 AI 辅助整理，请以论文原文为准。

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13 pages, 3 figures