论文标题
对接近超导体的量子自旋的兴奋
Pair excitations of a quantum spin on a proximitized superconductor
论文作者
论文摘要
与超导体相互作用的磁性杂质会形成丰富的激发光谱，该光谱是由准粒子和自旋状态的叠加形成的，这些光谱在隧道光谱中以Yu-Shiba-Rusinov和Spin-Flip激发的形式出现。在这里，我们表明，隧道电子还可以在存在磁杂质的情况下激发超导式的破坏性过渡，该杂质隐藏在裸露超导体上的电子中。将扫描隧道光谱与理论建模相结合，我们绘制了在Au/V（100）接近近端的表面上的Fe-卟啉分子的激发光谱，以形成多体激发的流形，并遵循其在改变奇偶校验变化的过渡过程中的行为。随着强烈相互作用态度的间隙之外的峰值，将对隧道光谱中的对激发出现，并与对相关性进行缩放。我们的结果揭示了超导体上磁杂质的量子性质，并证明对激发是磁杂质的奇偶校验检测器。
A magnetic impurity interacting with a superconductor develops a rich excitation spectrum formed by superposition of quasiparticles and spin states, which appear as Yu-Shiba-Rusinov and spin-flip excitations in tunneling spectra. Here, we show that tunneling electrons can also excite a superconducting pair-breaking transition in the presence of magnetic impurities, which is hidden for electrons on bare superconductors. Combining scanning tunneling spectroscopy with theoretical modeling, we map the excitation spectrum of a Fe-porphyrin molecule on the Au/V(100) proximitized surface into a manifold of many-body excitations and follow their behavior across a parity-changing transition. Pair excitations emerge in the tunneling spectra as peaks outside the gap in the strong interaction regime, scaling with the pair correlation. Our results unravel the quantum nature of magnetic impurities on superconductors and prove that pair excitations are parity detectors for magnetic impurities.
