SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II
TT 8.2: Vortrag
Dienstag, 28. September 2021, 13:45–14:00, H7
Spin-polarized zero bias peak from a single magnetic impurity at a s-wave superconductor — •Kyungwha Park1, Bendeguz Nyari2, Andras Laszloffy3, Laszlo Szunyogh2, and Balazs Ujfalussy3 — 1Virginia Tech, Blacksburg, United States — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Wigner RCP, ELKH, Budapest, Hungary
Topological superconductivity has emerged a promising platform for quantum computing using Majorana modes. Since intrinsic topological superconductors are rare, various heterostructures including ferromagnetic atomic chains on s-wave superconductors have been proposed to realize topological superconductivity. So far, most theoretical studies in heterostructures were done using effective models. Here we investigate the Yu-Shiba-Rusinov (YSR) states of a single magnetic impurity at the surface of superconducting Pb using the fully relativistic first-principles simulations including DFT band structure of Pb and 3d orbitals of the impurity in the superconducting state. For the single Fe and Co impurities, we observe strong effects of spin-orbit coupling on the YSR states as the impurity moment rotates. As the rotation angle varies, we show that two symmetric same-spin YSR states of electron character merge and form a zero-bias peak (ZBP) with large spin polarization. According to effective models, whether a ZBP has net spin polarization or not is often used to determine its topological nature. Our results reveal importance of including realistic band structure and multiple 3d orbitals of the impurity in the calculations.