多铁性交替磁体Fe2Mo3O8中的应变可调移流和磁光克尔效应
Strain-Tunable Shift Current and Magneto-Optical Kerr Effect in Multiferroic Altermagnet Fe2Mo3O8
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中文总结 AI 辅助
研究多铁性交替磁体Fe2Mo3O8，采用第一性原理计算，发现切换铁电极化可反转移流符号并重塑自旋分裂纹理，移流和磁光谱在机械应变下可调，a轴单轴应变能激活原始相禁戒的磁光克尔效应。
中文摘要 AI 辅助
交替磁性最近已成为自旋电子学中一个引人注目的前沿领域，它将铁磁体的灵活可调性与反铁磁体的标志性优点无缝融合。作为具有独特交替磁性的典型极性多铁性材料，Fe2Mo3O8为探索铁电极化、交替磁序和自旋相关响应之间的复杂相互作用提供了理想的平台。在此，我们采用第一性原理计算，系统地研究了Fe2Mo3O8中极化、自旋分裂、移流和磁光响应之间的耦合。我们的发现表明，切换铁电极化不仅会反转移流的符号，还会全面重塑动量空间中的自旋分裂纹理。此外，移流和磁光谱在机械应变下表现出很强的可调性。值得注意的是，施加a轴单轴应变会破坏晶体对称性，从而激活在原始相中原本被禁止的有限磁光克尔效应。
英文摘要
Altermagnetism has recently emerged as a compelling frontier in spintronics, seamlessly merging the agile tunability of ferromagnets with the hallmark merits of antiferromagnets. As a prototypical polar multiferroic featuring distinctive altermagnetism, Fe2Mo3O8 hosts an ideal playground for exploring the intricate interplay among ferroelectric polarization, altermagnetic order, and spin-dependent responses. Here, employing first-principles calculations, we systematically investigate the coupling among polarization, spin splitting, shift current, and magneto-optical responses in Fe2Mo3O8. Our findings reveal that switching the ferroelectric polarization not only inverts the sign of the shift current but also comprehensively reshapes the momentum-space spin-splitting texture. Furthermore, the shift current and magneto-optical spectrum exhibits strong tunability under mechanical strain. Remarkably, the application of a-axis uniaxial strain breaks the crystalline symmetry, thereby activating a finite magneto-optical Kerr effect that is otherwise forbidden in the pristine phase.
