Journal Article

PUBDB-2025-02496

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Odd-parity ground state in dilute Yu-Shiba-Rusinov dimers and chains

Rütten, L. M. ; Schmid, H. ; van Weerdenburg, W. M. J. ; Liebhaber, E. ; Rossnagel, K.DESY* ; Franke, K. J.

2025
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.111.205424  doi:10.3204/PUBDB-2025-02496

Abstract: Magnetic adatoms on superconductors induce Yu-Shiba-Rusinov (YSR) states, which are key to the design of low-dimensional correlated systems and topological superconductivity. Competing magnetic interactions and superconducting pairing lead to a rich phase diagram. Using a scanning tunneling microscope (STM), we position Fe atoms on 2⁢𝐻−NbSe$_2$to build a dimer with an odd-parity ground state, i.e., a partially screened YSR channel with the hybridized states spanning the Fermi level. This ground state makes the dimer a promising precursor for a topological YSR chain. By adding one atom at a time, we track the formation of YSR bands. The lowest-energy band crosses the Fermi level, and we find strong site-dependent spectral variations especially at the chain's terminations. We attribute these features to quantum spin effects and ferromagnetic coupling influenced by the local chemical environment.

Note: We thank Felix von Oppen and Gal Lemut for fruitfuldiscussions. We gratefully acknowledge financial support bythe Deutsche Forschungsgemeinschaft (DFG, German Re-search Foundation) through Projects No. 277101999 (CRC183, Project No. C03) and No. 328545488 (CRC 227,Project No. B05). LMR acknowledges membership in theInternational Max Planck Research School “Elementary Pro-cesses in Physical Chemistry.”

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Contributing Institute(s):

1. FS-SXQM (FS-SXQM)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. DFG project G:(GEPRIS)316546650 - Hybride topologische Plattformen (C03) (316546650) (316546650)
3. DFG project G:(GEPRIS)328545488 - TRR 227: Ultraschnelle Spindynamik (328545488) (328545488)
4. DFG project G:(GEPRIS)277101999 - TRR 183: Verschränkte Materiezustände (277101999) (277101999)
5. DFG project G:(GEPRIS)397935742 - Spindynamik in atomar präzisen Nanostrukturen (B05) (397935742) (397935742)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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