SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Yu-Shiba-Rusinov Systems
TT 8.3: Talk
Monday, March 27, 2023, 15:45–16:00, HSZ 103
Yu-Shiba-Rusinov states of quantum impurities in spin-split superconductors — •Anastasiia Skurativska1, Jon Ortuzar2, Sebastian Bergeret1,3, Dario Bercioux1,4, and Miguel Angel Cazalilla1,4 — 1DIPC, 20018 San Sebastian, Spain — 2CIC nanoGUNE-BRTA, 20018 San Sebastian, Spain — 3CFM-MPC Centro Mixto CSIC-UPV/EHU, 20018 San Sebastian, Spain — 4IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain
Yu-Shiba-Rusinov (YSR) states arise as a sub-gap excitations in a system of magnetic impurity coupled to a superconducting host. Despite the quantum nature of their spin degree of freedom, magnetic impurities in such systems are often described by a classical spin. Taking into account quantum nature of the impurity-spin has proven to give useful insights into the ground-state and excitation properties of the magnetic impurity-superconductor system.
Here, we report on the spectral properties of the YSR states of a magnetic impurity on a spin-split superconductor. Using the zero-bandwidth approximation we obtain the spectral function of the YSR states. Unlike the classical model which predicts full spin polarization for the YSR peaks, we find the quantum model predicts partial polarization. The parity-changing phase transition switches the spin polarization of the YSR peaks after crossing at the center of the superconducting gap. We discuss the possibility of using this effect as a tunable spin-filter in a quantum dot or a molecule in proximity to a spin-split superconductor.