论文标题
单个超导体结合状态之间的自旋依赖性隧道
Spin-dependent tunneling between individual superconducting bound states
论文作者
论文摘要
超导体上的磁杂质在超导间隙内诱导离散的结合水平，称为Yu-Shiba-Rusinov（YSR）状态。 YSR水平已完全自旋偏振，因此YSR状态之间的隧穿取决于它们的相对自旋方向。在这里，我们使用扫描隧道光谱法通过实验提取自旋之间的角度来解决两个YSR状态之间的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率直接提取两个YSR状态之间的相对旋转方向。我们发现自由旋转旋转至7MK，表明杂质的纯属磁性性质。这种非共线自旋对齐不仅对于产生主要界面状态至关重要，而且是操纵和将主要状态转移到尖端上的前景。
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.
