Publikation: Spin-dependent tunneling between individual superconducting bound states
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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 7 mK, indicating a purely paramagnetic nature of the impurities. Such a noncollinear 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.
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HUANG, Haonan, Jacob SENKPIEL, Ciprian PADURARIU, Robert DROST, Alberto VILLAS, Raffael L. KLEES, Alfredo Levy YEYATI, Juan Carlos CUEVAS, Klaus KERN, Christian R. AST, 2021. Spin-dependent tunneling between individual superconducting bound states. In: Physical Review Research. American Physical Society. 2021, 3(3), L032008. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.3.L032008BibTex
@article{Huang2021-07-08Spind-54255, year={2021}, doi={10.1103/PhysRevResearch.3.L032008}, title={Spin-dependent tunneling between individual superconducting bound states}, number={3}, volume={3}, journal={Physical Review Research}, author={Huang, Haonan and Senkpiel, Jacob and Padurariu, Ciprian and Drost, Robert and Villas, Alberto and Klees, Raffael L. and Yeyati, Alfredo Levy and Cuevas, Juan Carlos and Kern, Klaus and Ast, Christian R.}, note={Article Number: L032008} }
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