Quantum Magnetism and Topological Superconductivity in Yu-Shiba-Rusinov Chains

Jacob F. Steiner, Christophe Mora, Katharina J. Franke, and Felix von Oppen
Phys. Rev. Lett. 128, 036801 – Published 21 January 2022
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Abstract

Chains of magnetic adatoms on superconductors have been discussed as promising systems for realizing Majorana end states. Here, we show that dilute Yu-Shiba-Rusinov (YSR) chains are also a versatile platform for quantum magnetism and correlated electron dynamics, with widely adjustable spin values and couplings. Focusing on subgap excitations, we derive an extended tJ model for dilute quantum YSR chains and use it to study the phase diagram as well as tunneling spectra. We explore the implications of quantum magnetism for the formation of a topological superconducting phase, contrasting it to existing models assuming classical spin textures.

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  • Received 4 June 2021
  • Revised 2 November 2021
  • Accepted 7 January 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.036801

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jacob F. Steiner1, Christophe Mora1,2, Katharina J. Franke3, and Felix von Oppen1

  • 1Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
  • 2Laboratoire Matériaux et Phénomènes Quantiques, CNRS, Université de Paris, 75013 Paris, France
  • 3Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany

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Issue

Vol. 128, Iss. 3 — 21 January 2022

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