揭示带式混合库珀对在具有旋转轨道合的超导体表面
Javier Zaldívar1, Jon Ortuzar1, Miguel Alvarado2,3
1CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain.
Physical review letters
|October 12, 2025
概括
这项研究揭示了超导体β-Bi_{2}Pd中不同表面带之间的奇特库珀对形成. 这一发现通过扫描道显微镜观察,突出了新的多带超导机制.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 超导性研究研究超导性.
- 材料科学是一种材料科学.
背景情况:
- 超导体通常具有单带,自旋单点配对的特点.
- 具有强大的旋转轨道合的多带系统允许复杂的配对对称性,包括跨带Cooper对.
- 了解这些异国情境对于推进量子材料和技术至关重要.
研究的目的:
- 为了研究多带超导体β-Bi_{2}Pd中库珀对形成的性质.
- 探索旋转轨道合和频段间混合在异国情调超导状态中的作用.
- 为库珀对在自旋无生成螺旋表面带之间形成提供实验证据.
主要方法:
- 使用扫描道显微镜 (STM) 探测β-Bi_{2}Pd的电子特性.
- 诱导的Yu-Shiba-Rusinov (YSR) 共振使用杂质来检测超导状态.
- 分析了Bogoliubov准粒子干扰 (BQPI) 的异构性模式,以了解准粒子散射和库珀对形成.
主要成果:
- 在杂物周围观察到异构的YSR共振,表明局部磁效应.
- 在YSR共振中检测到远程振幅调制,归因于BQPI.
- 在亚间隙YSR能量的BQPI分析揭示了正常状态散射过程的选择性贡献,指向带间混合.
- 通过杂质散射确定了螺旋表面带和其他带之间的杂交,作为选择性的来源.
结论:
- 提供了在β-Bi_{2}Pd中自旋无生成螺旋表面带之间形成库珀对的证据.
- 证明杂质诱导的杂交在使互带Cooper对形成中起着关键作用.
- 这些发现为具有强大的自旋轨道合的多带超导体中复杂的配对机制提供了新的见解.
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