Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Poster: 2D Materials
O 29.23: Poster
Dienstag, 19. März 2024, 12:30–14:30, Poster A
Spin polarisation of an Anderson impurity state in MoS2 mirror twin boundaries — •Tfyeche Y. Tounsi1, Mahasweta Bagchi1, Affan Safeer1, Camiel van Efferen1, Thomas Michely1, Wouter Jolie1, Theo A. Costi2, and Jeison Fischer1 — 1II. Physikalisches Institut, Universität zu Köln, Germany — 2Peter Grünberg Institut, Forschungszentrum Jülich, Germany
Mirror twin boundaries (MTB) are line defects found in monolayer MoS2 islands grown via molecular beam epitaxy on graphene on Ir(111). MTBs form a well-defined 1D system of finite length, hosting confined states. When the highest occupied confined state is at the Fermi level, it splits into a singly occupied and doubly unoccupied states, defining an Anderson impurity. The interaction with the substrate electron bath establishes a Kondo resonance [1].
Here, spin-polarised scanning tunnelling spectroscopy measurements on an MTB in presence of out-of-plane magnetic field at a temperature of 0.4 K show an intensity change of the impurity peaks and Kondo resonance as a function of magnetic field. The experimental data is compared to numerical renormalization group calculations, demonstrating the full spin polarisation of both Anderson impurity sates and Kondo resonance.
[1] van Efferen et al., Nat. Phys. (2023).
https://doi.org/10.1038/s41567-023-02250-w.
Keywords: SP-STM; Mirror Twin Boundaries; MoS2; Anderson impurity; Kondo