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Article Dans Une Revue Journal of Physical Chemistry C Année : 2020

Adsorption-Induced Kondo Effect in Metal-Free Phthalocyanine on Ag(111)

Julien Granet
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Muriel Sicot
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Thomas Pierron
Bertrand Kierren
Luc Moreau
Yannick Fagot-Revurat
Daniel Malterre

Résumé

We report on the formation of a two-dimensional supramolecular Kondo lattice made of organic molecules comprising only C, N, and H atoms, namely metal-free phthalocyanines 2HPc (C 32 H 18 N 8), adsorbed on a Ag(111) surface. Low-temperature scanning tunneling microscopy/spectroscopy (LT-STM/STS), ultraviolet photoemission spectroscopy (UPS), and density functional theory (DFT) are used to investigate the electronic structure of the system for low molecular density and commensurate self-assemblies. Abrikosov− Suhl resonances that are characteristic of the arising of a Kondo effect are observed by using both STS and UPS at low temperature. Whereas freestanding 2HPc is a no-spin-bearing molecule, it acquires an unpaired electron in its πconjugated lowest unoccupied molecular orbital (LUMO) upon adsorption on Ag. As a result, the Kondo effect can be interpreted as originating from the interaction between this unpaired π-spin and the Ag Fermi sea. Extra side resonances are observed in STS spectra that are a manifestation of the coupling between the π electron and molecular vibrational excitations, qualifying the effect as the molecular vibrational Kondo effect. The variation of the Kondo temperature T K of single molecules and upon two-dimensional self-assembly is discussed. This study brings new insights into the Kondo-related physics in correlation with molecular spins and low dimensionality. Moreover, it may open new routes to the synthesis of organic molecular spintronic devices.
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hal-03079564 , version 1 (08-09-2021)

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Julien Granet, Muriel Sicot, Iann C Gerber, Geoffroy Kremer, Thomas Pierron, et al.. Adsorption-Induced Kondo Effect in Metal-Free Phthalocyanine on Ag(111). Journal of Physical Chemistry C, 2020, 124 (19), pp.10441-10452. ⟨10.1021/acs.jpcc.9b11141⟩. ⟨hal-03079564⟩
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