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Tuning a two-impurity Kondo system by a moir'e superstructure | | Sergey Trishin
; Christian Lotze
; Friedemann Lohss
; Giada Franceschi
; Leonid I. Glazman
; Felix von Oppen
; Katharina J. Franke
; | | Date: |
4 Jan 2023 | | Abstract: | Two-impurity Kondo models are paradigmatic for correlated spin-fermion
systems. Working with Mn atoms on Au(111) covered by a monolayer of MoS$_2$, we
tune the inter-adatom exchange via the adatom distance and the adatom-substrate
exchange via the location relative to a moir’e structure of the substrate.
Differential-conductance measurements on isolated adatoms exhibit Kondo peaks
with heights depending on the adatom location relative to the moir’e
structure. Mn dimers spaced by a few atomic lattice sites exhibit split Kondo
resonances. In contrast, adatoms in closely spaced dimers couple
antiferromagnetically, resulting in a molecular-singlet ground state. Exciting
the singlet-triplet transition by tunneling electrons, we find that the
singlet-triplet splitting is surprisingly sensitive to the moir’e structure.
We interpret our results theoretically by relating the variations in the
singlet-triplet splitting to the heights of the Kondo peaks of single adatoms,
finding evidence for coupling of the adatom spin to multiple conduction
electron channels. | | Source: | arXiv, 2301.01517 | | Services: | Forum | Review | PDF | Favorites | |
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