线极化laser辐照下结界面的直流和交变磁振子自旋流
Direct and alternating magnon spin currents across a junction interface irradiated by linearly polarized laser
摘要：
量子光学领域的发展提高了人们的期望，即激光-物质耦合是一个有前途的构建模块的磁。本文提出了一种利用线偏振激光在结界面上产生磁振子直流和交流自旋电流的方法。在具有大电子能隙的铁磁绝缘体结中，自旋角动量在磁振子穿过结界面的隧穿过程中发生交换。等离子体和超材料领域的先进技术实现了激光场照射的自旋通过塞曼耦合仅与激光的磁性分量相互作用。利用解析微扰理论，我们给出了由反转对称破缺引起的磁振子输运的一般公式。然后，我们证明了这些自旋电流被铁磁共振增强，并且交流自旋电流的周期是激光磁场的一半。最后，我们估计的自旋电流的大小，并发现它将在实验范围内。
英文摘要：
The developments in the field of quantum optics raise expectations that laser-matter coupling is a promising building block for magnonics. Here, we propose a method for the generation of direct and alternating spin currents of magnons across the junction interface irradiated by linearly polarized laser. In a junction of ferromagnetic insulators with a large electronic gap, the spin angular momentum is exchanged during the tunneling process of magnons across the junction interface. The advanced technology in the field of plasmonics and metamaterials realizes that spins irradiated by the laser field interact only with the magnetic component of the laser through the Zeeman coupling. Using an analytic perturbation theory, we provide a general formula for magnon transport induced by the inversion symmetry breaking across the junction interface. Then, we show that those spin currents are enhanced by the ferromagnetic resonance, and the period of the ac spin current is one-half of that of the laser magnetic field. Finally, we estimate the magnitude of the spin current, and find that it will be within experimental reach.
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