费米表面旋转纹理和旋转轨道自由非对线反铁磁体中的拓超导性
Seung Hun Lee1, Yuting Qian1, Bohm-Jung Yang1
1Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea; Center for Theoretical Physics (CTP), Seoul National University, Seoul 08826, Korea; and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea.
Physical review letters
|May 28, 2024
概括
金属中的非对线磁顺序可以在费米表面上产生自旋纹理,从而影响超导. 这项研究将变磁性扩展到非对线结构,揭示了拓式自旋三重体超导.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子材料是一种量子材料.
背景情况:
- 了解磁性和超导性之间的相互作用对于新的量子现象至关重要.
- 非对线性磁力,特别是在缺乏自旋轨道合的金属中,提出了独特的理论挑战.
- 变磁主义为探索异国情调的磁性和电子状态提供了一个新的范式.
研究的目的:
- 调查非对线反铁磁金属在没有自旋轨道合的情况下在费米表面上出现自旋纹理的情况.
- 为了确定磁性排序,费米表面旋转纹理和超导间隙结构之间的关系.
- 将变磁的概念扩展到非线性磁体结构,并探索它们的超导性质.
主要方法:
- 扰乱性的理论方法来分析磁顺序和旋转纹理.
- 在磁单元细胞中研究具有超过三个子格子的金属.
- 在kagome网格上的非线性反铁磁体的案例研究.
主要成果:
- 非对线磁顺序可以诱导动量依赖的费米表面旋转纹理,即使没有旋转轨道合.
- 诱导的旋转纹理决定了超导间隙的节点结构.
- 在kagome反铁磁体中证明了奇偶平价自旋三重子超导的出现,具有拓性质.
结论:
- 非线性磁性是一种可行的机制,可以产生与超导性相关的复杂自旋纹理.
- 这些发现扩展了对变磁的理论框架,包括非对线性自旋结构.
- 这项工作为设计基于非对线磁性材料的新型拓超导体铺平了道路.
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