在层次 AuSn4 中的内在表面 p 波超导
Wenliang Zhu1, Rui Song2, Jierui Huang3
1School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710119, China.
Nature communications
|November 3, 2023
概括
研究人员在层次 AuSn4.4 中发现了内在表面拓超导性 (IS-TSC). 这一发现为实现拓超导 (TSC) 和Majorana模式提供了一个新的材料平台.
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:
- 在Majorana模式中寻求拓超导 (TSC),但制造TSC异构结构和内在TSC材料面临挑战.
- 实现TSC的现有方法受到物质约束,障碍灵敏度和拓限制的限制.
研究的目的:
- 在分层材料中报告一种新型的内在拓超导性 (IS-TSC).
- 在AuSn4中展示IS-TSC,并研究其在拓量子计算中的潜在应用的特性.
主要方法:
- 合成了多层AuSn4并描述了其超导特性.
- 利用磁传输测量和点接触光谱 (PCS) 来探测超导.
- 执行了第一原理计算,以了解电子结构和配对机制.
主要成果:
- AuSn4表现出固有的表面拓超导性 (IS-TSC),临界温度 (Tc) 为2.4K.
- 通过在平面内和平面外的明显的上临界场证实了二维 (2D) 超导.
- 在磁转运和零偏差导电性峰值 (ZBCP) 中的双对称角依赖表明了非常规的配对对称性.
- 观察到具有Rashba分裂的超导间隙和表面多频段,这表明p波表面和s波批量贡献的混合.
结论:
- 层状AuSn4是一种新型材料,具有内在表面拓超导性 (IS-TSC).
- 观察到的2D非常规超导性来自表面和散装贡献的相互作用,受到Rashba效应的影响.
- AuSn4为实现拓超导 (TSC) 和探索层级材料中的Majorana模式提供了一个有前途的新范式.
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