超流体中的拓节点线3 他和安德森定理
T Kamppinen1, J Rysti1, M-M Volard1
1Department of Applied Physics, Aalto University, POB 15100, FI-00076, AALTO, Finland.
Nature communications
|July 17, 2023
概括
不同类型的超导和超流动性易受杂质的影响. 这项研究表明,定向缺陷保护超流体3HeHe.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 超流动性和超导性 超流动性和超导性
背景情况:
- 超导体和超流体 (例如,d-wave cuprates,p-wave superfluid 3He) 中的异型配对对杂质非常敏感,阻碍了实际应用.
- 安德森定理保护了传统的超导性免受非磁性杂质的影响,但它对非传统系统的扩展是一个开放的问题.
- 一个最近的猜想提出,如果杂质散射产生独立的,受保护的子系统,那么非常规系统可以实现对混乱的稳定性.
研究的目的:
- 通过实验验证特定杂质配置可以使非传统的超流动性对混乱产生强大的猜测.
- 研究定向柱状缺陷对超流体3He.fluid极相能量间隙和节点结构的影响.
主要方法:
- 在含有定向柱状非磁性缺陷的超流体3He中测量能量差距的温度依赖性.
- 利用超流体3He极相的独特特性,该超流体具有迪拉克节点线.
主要成果:
- 发现定向柱状缺陷对超流体3He.fluid极相的能量光谱的影响很小.
- 尽管有强烈的散射,但沿缺陷柱的动量被保留了下来,有效地创建了强大的子系统.
- 实验结果与假设一致,即杂质散射可以形成受保护的子系统,增强强性.
结论:
- 该研究通过实验证实,特定类型的疾病,如定向柱状缺陷,可以保护3He中的非传统超流动性.
- 这一发现支持了关于通过杂质散射形成强大的子系统的理论猜测.
- 这些结果可能为未来研究保护拓超导和理解拓费米子平面带的研究铺平了道路.
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