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arXiv 2012.09257cond-mat.supr-con
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单个超导束缚态之间的自旋依赖隧穿

Spin-dependent tunneling between individual superconducting bound states

Haonan Huang, Jacob Senkpiel, Ciprian Padurariu, Robert Drost, Alberto Villas, Raffael L. Klees, Alfredo Levy Yeyati, Juan Carlos Cuevas, Björn Kubala, Joachim … 展开作者

Haonan Huang, Jacob Senkpiel, Ciprian Padurariu, Robert Drost, Alberto Villas, Raffael L. Klees, Alfredo Levy Yeyati, Juan Carlos Cuevas, Björn Kubala, Joachim Ankerhold, Klaus Kern, Christian R. Ast

AI总结:

本研究利用扫描隧道光谱技术,通过分析热激活与直接光谱特征的比值提取两个 YSR 态间的相对自旋取向,发现低至 7mK 仍存在自由旋转的顺磁自旋,揭示了非共线自旋排列对产生和操控 Majorana 束缚态的重要性。

摘要:

超导体上的磁性杂质会在超导能隙内诱导出离散的束缚能级,称为 Yu-Shiba-Rusinov (YSR) 态。YSR 能级是完全自旋极化的,因此 YSR 态之间的隧穿取决于它们的相对自旋取向。在这里,我们使用扫描隧道光谱技术,通过实验提取自旋之间的角度,来解析两个 YSR 态之间隧穿过程中的自旋动力学。为此,我们利用测量中热激活和直接光谱特征的比值,直接提取两个 YSR 态之间的相对自旋取向。我们发现在低至 7mK 的温度下仍存在自由旋转的自旋,这表明杂质具有纯顺磁性质。这种非共线自旋排列不仅对于产生 Majorana 束缚态至关重要,而且作为前景,对于在针尖上操控和移动 Majorana 态也具有重要意义。

英文摘要:

Magnetic impurities on superconductors induce discrete bound levels inside the superconducting gap, known as Yu-Shiba-Rusinov (YSR) states. YSR levels are fully spin-polarized such that the tunneling between YSR states depends on their relative spin orientation. Here, we use scanning tunneling spectroscopy to resolve the spin dynamics in the tunneling process between two YSR states by experimentally extracting the angle between the spins. To this end, we exploit the ratio of thermally activated and direct spectral features in the measurement to directly extract the relative spin orientation between the two YSR states. We find freely rotating spins down to 7mK, indicating a purely paramagnetic nature of the impurities. Such a non-collinear spin alignment is essential not only for producing Majorana bound states but also as an outlook manipulating and moving the Majorana state onto the tip.

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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