arXiv 2108.102582021-08cond-mat.str-el

通过静态和时间分辨二次谐波产生识别和跟踪Fe₂Mo₃O₈中的磁诱导极化

Identifying and tracking magnetically induced polarization in Fe$_2$Mo$_3$O$_8$ by static and time-resolved second harmonic generation

International Center for Quantum Materials, School of Physics, Peking University（北京大学物理学院量子材料科学中心）；Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；Tsung-Dao Lee Institute, Shanghai JiaoTong University（上海交通大学李政道研究所）

L. Y. Shi, D. Wu, T. Lin, S. J. Zhang, Q. M. Liu, Z. X. Wang, T. C. Hu, T. Dong, N. L. Wang

备注：: 6 pages. 5 figures

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AI总结：

结合静态和时间分辨二次谐波产生研究Fe₂Mo₃O₈，静态SHG确定c轴极性响应与磁序耦合，时间分辨SHG跟踪其动力学，结果表明SHG可探测超快磁电动力学，Fe₂Mo₃O₈磁诱导极化对光激发敏感。

摘要：

多铁材料为耦合磁和极序的超快光学控制提供了有前景的平台。通过结合静态和时间分辨二次谐波产生（SHG）解决Fe₂Mo₃O₈中磁诱导极化问题。温度依赖的静态SHG识别出c轴极性响应，时间分辨SHG跟踪其动力学，结果表明SHG是超快磁电动力学的张量选择性探针，且Fe₂Mo₃O₈磁诱导极化对光激发高度敏感。

英文摘要：

Multiferroic materials offer a promising platform for ultrafast optical control of coupled magnetic and polar orders. However, a prerequisite for such control is to precisely identify how the magnetically induced polarization manifests itself on the ultrafast timescale, and then to probe its dynamics upon external perturbations. Here, we address this issue in the polar magnet Fe$_2$Mo$_3$O$_8$ by combining static and time-resolved second harmonic generation (SHG). Temperature-dependent static SHG reveals that, among the symmetry-allowed tensor elements, only $χ^{(2)}_{ccc}$ exhibits a pronounced anomaly at the antiferromagnetic transition ($T_{\rm N} \approx 60$ K), identifying the $c$-axis polar response as the primary degree of freedom coupled to the magnetic order. Guided by this result, time-resolved SHG selectively tracks the dynamics of this tensor element following ultrafast photoexcitation. We observe a rapid enhancement of the $χ^{(2)}_{ccc}$-related SHG signal, followed by biexponential recovery. The response is independent of the pump polarization, consistent with an ultrafast thermal origin, but is achieved at a fluence significantly below that required for conventional lattice heating. These results establish SHG as tensor-selective probe of ultrafast magnetoelectric dynamics and demonstrate the high sensitivity of the magnetically induced polarization in Fe$_2$Mo$_3$O$_8$ to optical excitation.

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