通过界面交换相互作用耦合到超导微波腔的反铁磁绝缘体系统中磁振子与等离子体激元的相互作用
Interaction of magnons with plasmons in a system of antiferromagnetic insulators coupled to a superconductor microwave cavity through the interfacial exchange interaction
摘要：
超导体可以通过由超导电流感生的磁场与磁体相互作用。然而，这种相互作用是相当弱的，需要相对较大的磁体来达到微波电磁模式与磁振子的相当大的混合。利用磁体和超导体中自旋之间的大界面交换相互作用，可以大大减小器件的尺寸。在自旋轨道耦合超导体中，这种相互作用可以通过三重态和单重态库珀对的混合传递到s波凝聚体。在本文中，我们从理论上考虑薄的反铁磁薄膜，使自旋补偿接触的超导导线，形成一个腔的Mooij-Schön等离子体波。导出了有效拉格朗日量，其中考虑了这些波与磁振子的相互作用。计算了混合磁振子-等离子体激元模的频率。还考虑了两个微磁体相距较远的系统，并计算了它们通过腔模的互耦合。
英文摘要：
A superconductor can interact with magnets through the magnetic field which is induced by the supercurrent. However, this interaction is rather weak and requires relatively large magnets to reach a sizable hybridization of microwave electromagnetic modes with magnons. The size of the device can be drastically reduced by means of the large interfacial exchange interaction between spins in a magnet and a superconductor. In the spin-orbit coupled superconductor this interaction can be transmitted to the s-wave condensate through a mixing of triplet and singlet Cooper pairs. In this paper we theoretically consider thin antiferromagnetic films, which make a spin compensated contact to a superconducting wire, which forms a cavity for Mooij-Schön plasma waves. The effective Lagrangian is derived where the interaction of these waves with magnons is taken into account. Frequencies of hybrid magnon-plasmon modes are calculated. A system of two micromagnets placed far apart are also considered and their mutual coupling through the cavity mode is calculated.
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