Iron phthalocyanine on Au(111) is a “non-Landau” Fermi liquid

R. Žitko (), G. G. Blesio, L. O. Manuel and A. A. Aligia
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R. Žitko: Jožef Stefan Institute
G. G. Blesio: Jožef Stefan Institute
L. O. Manuel: Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario
A. A. Aligia: Centro Atómico Bariloche and Instituto Balseiro

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The paradigm of Landau’s Fermi liquid theory has been challenged with the finding of a strongly interacting Fermi liquid that cannot be adiabatically connected to a non-interacting system. A spin-1 two-channel Kondo impurity with anisotropy D has a quantum phase transition between two topologically different Fermi liquids with a peak (dip) in the Fermi level for D Dc). Extending this theory to general multi-orbital problems with finite magnetic field, we reinterpret in a unified and consistent fashion several experimental studies of iron phthalocyanine molecules on Au(111) that were previously described in disconnected and conflicting ways. The differential conductance shows a zero-bias dip that widens when the molecule is lifted from the surface (reducing the Kondo couplings) and is transformed continuously into a peak under an applied magnetic field. We reproduce all features and propose an experiment to induce the topological transition.

Date: 2021
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DOI: 10.1038/s41467-021-26339-z

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