Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Spins on surfaces at the atomic scale II
O 89.8: Vortrag
Donnerstag, 12. März 2026, 16:45–17:00, WILL/A317
Tuning the Kondo temperature of MoS2 mirror twin boundaries on graphene — •Tfyeche Y. Tounsi1, Kuber Vyas1, Camiel van Efferen1, Affan Safeer1, Achim Rosch2, Jeison Fischer1, Thomas Michely1, Theo A. Costi3, and Wouter Jolie1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany — 2Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany — 3Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany
In scanning tunneling spectroscopy, the dI/dV signatures of the Kondo effect in MoS2 mirror twin boundaries (MTBs) are the zero-bias resonance peak, in addition to the impurity levels [1]. The experimental data give access to the Anderson model parameters; The splitting U of the non-degenerate states, the impurity orbital’s position є with respect to EF, and the impurity level’s bare width γ0.
In this work, we compare the Kondo temperature TK measured in MTBs of MoS2 grown on three different substrates. In the case of MoS2 / Graphene (Gr) / Ir (111), TK was in the range [10−4 K, 10−10 K] [1]. By intercalating with a single layer of Eu under Gr, we have noticed a decrease of γ0, leading to a drop in TK. The third system, MoS2 / Gr / Ir (110), TK increased significantly to the range [1 K, 10 K]. This enabled us to study the Kondo effect at the boundary between the weakly screened magnetic state above TK and the Kondo singlet state below TK.
References: [1] C. van Efferen et al, Nat. Phys. 20, 82-87 (2024).
Keywords: STM; STS; Kondo effect; Anderson model; NRG