温和Floquet控制轨道霍尔效应与轨道逆法拉第效应

中文摘要 AI 辅助

Floquet工程通过时间周期电磁驱动控制材料响应。实际中的一个重要任务是降低实现Floquet工程所需的驱动强度。我们表明，在具有强相空间约束的系统中，当响应由动量空间的小区域主导时，共振Floquet驱动的相对影响会增强。我们以轨道霍尔效应为例演示了这一想法，其中平衡占据将带间相干性限制在窄动量区间$\hbar\Delta k$内。比值$eE_0/(\Omega_0\hbar\Delta k)$（其中$\Omega_0$是驱动频率）即使在适度的场振幅$E_0$下也相当可观，导致轨道霍尔电导率发生大的相对变化。由于非平凡的轨道纹理，圆偏振驱动通过磁化电子诱导逆轨道法拉第效应。我们表明，相应的磁化率由决定共振Floquet杂化的带间量子度量控制。

英文摘要

Floquet engineering controls material responses via a time-periodic electromagnetic drive. An important task in practice is to reduce the driving strengths required to implement Floquet protocols. We show that in systems with strong phase-space constraints, where the response is dominated by a small region of momentum space, the relative impact of a resonant Floquet drive is enhanced. We demonstrate this idea on the example of the orbital Hall effect, where equilibrium occupations restrict the interband coherence to a narrow momentum interval $\hbarΔk$. The ratio $eE_0/(Ω_0\hbarΔk)$, where $Ω_0$ is the frequency of the drive, is considerable even at modest field amplitudes $E_0$, leading to a large relative change in the orbital Hall conductivity. Due to the non-trivial orbital texture, the circularly polarized drive induces an inverse orbital Faraday effect by magnetizing the electrons. We show that the corresponding susceptibility is controlled by the interband quantum metric that determines the resonant Floquet hybridization.

发表机构

• Peking University（北京大学）
• Max-Planck-Institut für Physik komplexer Systeme（马克斯·普朗克复杂系统物理研究所）

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