自旋波在铁磁/阻挫铁磁结系统中的反射和折射过程
Reflection and refraction process of spinwave in a ferromagnet/frustrated ferromagnet junction system
摘要：
阻挫引入了自旋系统中即使在铁磁相中自旋波的非平凡色散关系。利用Holstein-Primakoff自旋波展开式和大S极限，研究了铁磁/阻挫铁磁结系统中自旋波的反射和折射过程.讨论了自旋波入射角与折射角的关系，即自旋波的Snell定律。作为阻挫铁磁体的具体例子，我们研究了J1-J2链中的全极化铁磁体相和正方晶格上的J1-J2模型。讨论了入射自旋波的分裂和负折射等有趣的折射过程。我们还研究了这些混凝土模型的透射率和反射率。
英文摘要：
Frustration introduces a nontrivial dispersion relation of spinwave even in a ferromagnetic phase in a spin system. We study the reflection and refraction process of spinwaves in the ferromagnet/frustrated ferromagnet junction system by using the Holstein-Primakoff spinwave expansion and taking the large-S limit. We discuss the relation between the incident angle and refraction angle of spinwave, namely, the Snell's low of spinwave. As concrete examples of frustrated ferromagnets, we study the fully polarized ferromagnet phases in the J1-J2 chains and the J1-J2 model on the square lattice. The interesting refraction processes, such as the splitting of the incident spinwave and the negative refraction, are discussed. We also study the transmittance and reflectance in these concrete models.
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