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Topological quantum phase transition of nickelocene on Cu(100)
by G. G. Blesio, R. \v{Z}itko, L. O. Manuel, A. A. Aligia
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Armando Aligia · Germán Blesio · Luis Manuel |
| Submission information | |
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| Preprint Link: | scipost_202208_00020v2 (pdf) |
| Date accepted: | 2022-12-01 |
| Date submitted: | 2022-11-08 05:22 |
| Submitted by: | Manuel, Luis |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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 \textit{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.
Author comments upon resubmission
List of changes
- In Section 2, we clarify that the topological transition to a non-Landau phase can be driven not only by increasing the anisotropy D, but also by decreasing the exchange coupling J or the hybridization $\tilde V$
- In Section 4, we add a calculation of the anisotropy taking the simplest part of the spin-orbit coupling to clarify its origin. We also write explicitly the states that are discussed as the relevant ones for small $\Gamma$. Also in this section, we correct the typo in Eq. (6), explain the absence of sharp peaks and dips in Fig. 3, and discuss the asymmetry in the figure.
- In Section 5, we refer to section 3 for the explanation of the two types of experimental behavior observed (A and B).
Published as SciPost Phys. 14, 042 (2023)