Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 30: Surface Magnetism (joint session O/MA)
O 30.3: Talk
Tuesday, April 2, 2019, 11:00–11:15, H37
Yu-Shiba-Rusinov states of Fe atoms on 2H-NbSe2 — •Eva Liebhaber1, Rojhat Baba1, Jannik Steinborn1, Gaël Reecht1, Sebastian Rohlf2, Kai Rossnagel2, Benjamin W. Heinrich1, Felix von Oppen1,3, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Germany. — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany. — 3Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Germany.
A magnetic impurity adsorbed on a superconducting substrate induces Yu-Shiba-Rusinov (YSR) states. These are low-energy bound states inside the superconducting energy gap. The symmetry and extent of the YSR wave function depends on the adsorption site (i.e. crystal field), the nature of the orbital hosting the impurity’s spin and the shape of the Fermi surface of the substrate.
We investigate single Fe atoms on 2H-NbSe2. 2H-NbSe2 belongs to the class of transition metal dichalcogenides (TMDCs) and is a layered van der Waals material with strong 2D character. In this material, superconductivity coexists with a charge density wave (CDW) at low temperatures. As the CDW is incommensurate with the lattice there are different local charge modulations present on the surface. Hence, adatoms sitting in identical hollow sites differ in their position relative to the CDW leading to variations in symmetry and energy of the YSR resonances.