在具有自旋轨道耦合的超导体中揭示带间电子配对
Revealing inter-band electron pairing in a superconductor with spin-orbit coupling
AI总结：
本文通过扫描隧道谱研究β-PdBi2表面钒吸附原子周围的YSR态和BQPI图样，揭示了该超导体中的带间电子配对，并证明能带选择性源于能带杂化，阐明了自旋轨道耦合在非常规配对机制中的关键作用。
摘要：
大多数超导机制在同一能带内配对电子，形成自旋单态。然而，多带超导的发现为配对开辟了新的场景，特别是在具有强自旋轨道耦合的体系中。在此，我们通过绘制沉积在β-PdBi2表面的钒吸附原子周围的亚能隙Yu-Shiba-Rusinov（YSR）态振幅图，揭示了超导体β-PdBi2中的带间配对。β-PdBi2表面的特征是在费米能级附近存在类自旋螺旋能带。扫描隧道谱揭示了杂质周围由自旋守恒的Bogoliubov准粒子干涉（BQPI）驱动的各向异性YSR振幅振荡。对YSR能量处BQPI图样的分析揭示了该材料中的带间配对。有趣的是，在正常态中观测到的所有可能的带间散射过程中，只有一小部分对BQPI图样有贡献。结合实验数据和理论，我们证明所观测到的能带选择性源于与杂质耦合的能带与其他能带之间的杂化。我们的发现揭示了β-PdBi2中非常规的配对机制，并强调了自旋轨道相互作用在其形成中的关键作用。
英文摘要：
Most superconducting mechanisms pair electrons within the same band, forming spin singlets. However, the discovery of multi-band superconductivity has opened new scenarios for pairing, particularly in systems with strong spin-orbit coupling. Here, we reveal inter-band pairing in the superconductor \bipd\ by mapping the amplitude of sub-gap Yu-Shiba-Rusinov (YSR) states around Vanadium adatoms deposited on its surface. The surface of \bipd\ is characterized by spin-helical-like bands near the Fermi level. Scanning tunneling spectroscopy reveals anisotropic YSR amplitude oscillations around the impurity, driven by spin-conserving Bogoliubov quasiparticle interference (BQPI). Analysis of the BQPI patterns at the YSR energy exposes inter-band pairing in this material. Interestingly, only a small subset of all possible inter-band scattering processes observed in the normal state contribute to the BQPI patterns. Combining experimental data and theory, we demonstrate that the observed band selectivity results from the hybridization of the band coupled with the impurity with other bands. Our findings reveal unconventional pairing mechanisms in \bipd\ and highlight the crucial role of spin-orbit interactions in their formation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
