SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: PhD Focus Session: Symposium on Strange Bedfellows - Magnetism Meets Superconductivity" (joint session MA/AKjDPG) (joint session MA/TT)

TT 16.5: Hauptvortrag

Donnerstag, 30. September 2021, 11:30–12:00, H5

Yu-Shiba-Rusinov states and ordering of magnetic Impurities near the boundary — •Jelena Klinovaja — University of Basel, Basel, Switzerland

In my talk, I will discuss properties of one and two magnetic impurities near the boundary of a one-dimensional nanowire in proximity to a conventional s-wave superconductor. We showed that the energies of the subgap states, supported by the magnetic impurities, are strongly affected by the boundary for distances less than the superconducting coherence length. When the impurity is moved towards the boundary, multiple quantum phase transitions periodically occur in which the parity of the superconducting condensate oscillates between even and odd. The magnetic ground-state configuration of two magnetic impurities depends not only on the distance between them, but also explicitly on their distance away from the boundary of the nanowire. As a consequence, the magnetic ground state can switch from ferromagnetic to antiferromagnetic while keeping the interimpurity distance unaltered by simultaneously moving both impurities away from the boundary.

[1] O. Deb, S. Hoffman, D. Loss, and J. Klinovaja, Phys. Rev. B 103, 165403 (2021). [2] H. Ding, Y. Hu, M. T. Randeria, S. Hoffman, O. Deb, J. Klinovaja, D. Loss, and A. Yazdani, Proc. Natl. Acad. Sci. USA 118, 14 (2021). [3] S. Hoffman, J. Klinovaja, T. Meng, and D. Loss, .Phys. Rev. B 92, 125422 (2015). [4] T. Meng, J. Klinovaja, S. Hoffman, P. Simon, and D. Loss, Phys. Rev. B 92, 064503 (2015).