标题： 多轨道模型中逆法拉第效应的微观理论：轨道磁矩和电偶极子的作用 显示英文标题

标题： Microscopic theory of the inverse Faraday effect in a multiorbital model: Role of orbital magnetic moment and electric dipole

摘要： 我们理论研究了逆法拉第效应（IFE），这是一种圆偏振光诱导磁矩的现象，在多轨道金属系统中。 我们证明在多轨道紧束缚模型中，总磁矩可以分解为几个贡献。 特别是，我们揭示了Wannier轨道的电偶极矩也对轨道磁矩有贡献，而这一点未包含在格子系统中轨道磁矩的传统表达式中。 为了考虑所有可能的贡献，我们采用一个$s$-$p$紧束缚系统作为IFE的最小模型。 基于Schrieffer-Wolff变换的分析方法，我们阐明了这些贡献的物理起源。 此外，我们通过基于Floquet形式的数值方法，对每个贡献进行了定量评估。 我们的结果表明，轨道磁矩的响应显著大于自旋磁矩，且轨道磁矩的所有贡献在量级上是相当的。 这些发现突显了轨道自由度在IFE中的关键作用。 显示英文摘要

摘要： We theoretically investigate the inverse Faraday effect (IFE), a phenomenon where circularly-polarized light induces a magnetic moment, in a multiorbital metallic system. We demonstrate that the total magnetic moment can be decomposed into several contributions in multiorbital tight-binding models. In particular, we reveal that the electric dipole moment of Wannier orbitals also contributes to the orbital magnetic moment, which is not included in the conventional expression for the orbital magnetic moment in lattice systems. To account for all possible contributions, we adopt an $s$-$p$ tight-binding system as a minimal model for the IFE. Using an analytical approach based on the Schrieffer-Wolff transformation, we clarify the physical origins of these contributions. Additionally, we quantitatively evaluate each contribution on an equal footing through a numerical approach based on the Floquet formalism. Our results reveal that the orbital magnetic moment exhibits a significantly larger response compared to the spin magnetic moment, with all contributions to the orbital magnetic moment being comparable in magnitude. These findings highlight the essential role of orbital degrees of freedom in the IFE.