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arXiv 2406.03029cond-mat.mtrl-scicond-mat.str-elphysics.optics
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时间反演奇反铁磁体中电场诱导的非互易方向二色性

Electric field-induced nonreciprocal directional dichroism in a time-reversal-odd antiferromagnet

Takeshi Hayashida, Koei Matsumoto, Tsuyoshi Kimura

AI总结:

本文利用电场诱导的非互易方向二色性(E-induced NDD)探测了由磁环单极子表征的T-odd反铁磁体Co2SiO4,成功观测到信号并实现畴态空间分布成像,揭示了磁场反转畴图样的压磁效应机制,为探测序参量提供了独特方法。

摘要:

破坏时间反演(T)对称性的反铁磁体(T-odd反铁磁体)引起了广泛关注,主要因为尽管没有净磁化,它们却表现出类似铁磁体的行为。然而,某些类型的T-odd反铁磁体仍无法通过典型的类铁磁现象(如反常霍尔效应)来探测。其中一种系统由T-odd标量即磁环单极子表征。为探测该系统中破坏的T对称性,我们采用了一种独特的非互易光学现象:电场诱导的非互易方向二色性(E-induced NDD)。我们在T-odd反铁磁体Co2SiO4中成功检测到了E-induced NDD的信号,其磁结构由磁环单极子表征。此外,通过对E-induced NDD进行空间分辨,我们可视化了通过T操作相互关联的一对畴态的空间分布。畴成像揭示了通过施加磁场实现畴图样的反转,这可归因于压磁效应导致的三线性耦合。我们对E-induced NDD的观测为探测T-odd反铁磁体中的序参量提供了一种独特方法。

英文摘要:

Antiferromagnets with broken time-reversal (T) symmetry (T-odd antiferromagnets) have gained extensive attention, mainly due to their ferromagnet-like behavior despite the absence of net magnetization. However, certain types of T-odd antiferromagnets remain inaccessible by the typical ferromagnet-like phenomena (e.g., anomalous Hall effect). One such system is characterized by a T-odd scalar quantity, the magnetic toroidal monopole. To access the broken T symmetry in such a system, we employ a unique nonreciprocal optical phenomenon, electric field-induced nonreciprocal directional dichroism (E-induced NDD). We successfully detected signals of E-induced NDD in a T-odd antiferromagnet, Co2SiO4, whose magnetic structure is characterized by the magnetic toroidal monopole. Furthermore, by spatially resolving the E-induced NDD, we visualized spatial distributions of a pair of domain states related to one another by the T operation. The domain imaging revealed the inversion of the domain pattern by applying a magnetic field, which is explained by trilinear coupling attributed to the piezomagnetic effect. Our observation of E-induced NDD provides a unique approach to accessing the order parameter in T-odd antiferromagnets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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