Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2

O 71.4: Talk

Thursday, September 8, 2022, 16:00–16:15, S051

Real-space observation of the Kondo effect in MoS₂ mirror twin boundaries — Camiel van Efferen¹, Jeison Fischer¹, Achim Rosch², Thomas Michely¹, and •Wouter Jolie¹ — ¹II. Physikalisches Institut, Universität zu Köln — ²Institut für Theoretische Physik, Universität zu Köln

Finite mirror twin boundaries in monolayer MoS₂ on graphene confine strongly correlated one-dimensional electronic states [1]. Using scanning tunneling microscopy and spectroscopy, we observe a resonance at the Fermi energy when the highest occupied confined state is filled with one electron. Magnetic field and temperature-dependence of the resonance unambiguously point to the Kondo effect, i.e., screening of the spin-1/2 confined state within the mirror twin boundary. Theoretical models for both Kondo resonance and spin-1/2 state are used to extract the Kondo coupling strength. Real-space mapping gives access to the correlated beating of both confined state and Kondo resonance along the boundary. Hence, our experiments reveal the behavior of the Kondo effect for a delocalized electronic state on the atomic scale.

[1] Jolie et al., Phys. Rev. X 9, 011055 (2019)