Topological quantum phase transition of nickelocene on Cu(100)
Local quantum phase transitions driven by Kondo correlations have been theoretically proposed in several magnetic nanosystems; however, clear experimental signatures are scant. Modeling a nickelocene molecule on a Cu(100) substrate as a two-orbital Anderson impurity with single-ion anisotropy couple...
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Veröffentlicht in: | SciPost physics 2023-03, Vol.14 (3), p.042, Article 042 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | Local quantum phase transitions driven by Kondo correlations have
been theoretically proposed in several magnetic nanosystems; however,
clear experimental signatures are scant. Modeling a nickelocene molecule
on a Cu(100) substrate as a two-orbital Anderson impurity with
single-ion anisotropy coupled to two conduction bands, we find that
recent scanning tunneling spectra reveal the existence of a topological
quantum phase transition from the usual local Fermi liquid with high
zero-bias conductance to a non-Landau Fermi liquid, characterized by a
non-trivial quantized Luttinger integral, with a small conductance. The
effects of intermediate valence, finite temperature, and structural
relaxation of the molecule position allow us to explain the different
observed behaviors. |
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ISSN: | 2542-4653 2542-4653 |
DOI: | 10.21468/SciPostPhys.14.3.042 |