SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Mini-Symposium: Manipulation and control of spins on functional surfaces I

O 31.4: Vortrag

Dienstag, 2. März 2021, 11:45–12:00, R2

Coupling of Yu-Shiba-Rusinov states on 2H-NbSe₂ — •Eva Liebhaber¹, Lisa Rütten¹, Gaël Reecht¹, Kai Rossnagel^2,3, Felix von Oppen^1,4, and Katharina J. Franke¹ — ¹Fachbereich Physik, Freie Universität Berlin, Germany. — ²Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany. — ³Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. — ⁴Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Germany.

A magnetic impurity adsorbed on a superconducting substrate leads to the formation of Yu-Shiba-Rusinov (YSR) states inside the superconducting energy gap. YSR wave functions of two adjacent magnetic adatoms can hybridize and form symmetric and antisymmetric linear combinations. Increasing the number of adatoms leads to the formation of Shiba bands.
We investigate magnetic Fe atoms on the superconductor 2H-NbSe₂ which is a layered van der Waals material. Its strong 2D electronic character leads to a large spatial extent of the YSR wave functions facilitating the coupling between them [1]. We assemble adatom chains using a superconducting tip and track the evolution of the YSR states. As the YSR states have been shown to be sensitive to the CDW [2] that coexists with superconductivity in NbSe₂ at low temperatures we further investigate the role of the CDW for the hybridization along extended chains.
[1] S. Kezilebieke et al., Nano Lett. 18, 2311 (2018)
[2] E. Liebhaber et al., Nano Lett. 20, 339 (2020)