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arXiv 2109.05511cond-mat.supr-con
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s波超导体中单个磁性杂质自旋极化零偏峰的第一性原理研究

Spin-polarized zero-bias peak from a single magnetic impurity at an s-wave superconductor: first-principles study

Kyungwha Park, Bendeguz Nyari, Andras Laszloffy, Laszlo Szunyogh, Balazs Ujfalussy

摘要:

超导体表面的磁性杂质可以在超导带隙中诱导出被称为Yu-Shiba-Rusinov(YSR)态的束缚态。对自旋轨道耦合(SOC)下YSR态的理解在Majorana零模研究中起着关键作用。自旋极化的零偏置峰(ZBP)被用来确定其拓扑性质。本文采用完全相对论第一性原理方法研究了Pb表面单个磁性杂质的YSR态,包括Pb的能带结构和超导态杂质的5个3 $d$轨道.我们发现,对于单一的Fe和Co杂质,强SOC可以诱导ZBP与旋转的杂质磁矩和ZBP具有大的自旋极化,有效的模型研究相反。讨论了由单一磁性杂质产生ZBP的条件。我们的结果是相关的较长的原子链考虑其倾斜和非共线磁性。

英文摘要:

Magnetic impurities at surfaces of superconductors can induce bound states referred to as Yu-Shiba-Rusinov (YSR) states within superconducting gaps. Understanding of YSR states with spin-orbit coupling (SOC) plays a pivotal role in studies of Majorana zero modes. Spin polarization of a zero-bias peak (ZBP) is used to determine its topological nature. Here we investigate the YSR states of single magnetic impurities at the surface of Pb using the fully relativistic first-principles simulations including band structure of Pb and five 3$d$ orbitals of the impurity in the superconducting state. We show that for single Fe and Co impurities, strong SOC can induce a ZBP with rotation of the impurity magnetic moment and that the ZBP has large spin polarization in contrast to effective model studies. Conditions for a ZBP from a single magnetic impurity are discussed. Our results are relevant to longer atomic chains considering their canting and noncollinear magnetism.

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。

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