Regensburg 2022 – wissenschaftliches Programm
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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: Vortrag
Donnerstag, 8. September 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)