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Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor

Magnetic atoms on a superconductor give rise to Yu-Shiba-Rusinov (YSR) states within the superconducting energy gap. A spin chain of magnetic adatoms on an s-wave superconductor may lead to topological superconductivity accompanied by the emergence of Majorana modes at the chain ends. For their usag...

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Detalles Bibliográficos
Autores principales: Kamlapure, A., Cornils, L., Wiebe, J., Wiesendanger, R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092363/
https://www.ncbi.nlm.nih.gov/pubmed/30108221
http://dx.doi.org/10.1038/s41467-018-05701-8
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author Kamlapure, A.
Cornils, L.
Wiebe, J.
Wiesendanger, R.
author_facet Kamlapure, A.
Cornils, L.
Wiebe, J.
Wiesendanger, R.
author_sort Kamlapure, A.
collection PubMed
description Magnetic atoms on a superconductor give rise to Yu-Shiba-Rusinov (YSR) states within the superconducting energy gap. A spin chain of magnetic adatoms on an s-wave superconductor may lead to topological superconductivity accompanied by the emergence of Majorana modes at the chain ends. For their usage in quantum computation, it is a prerequisite to artificially assemble the chains and control the exchange couplings between the spins in the chain and in the substrate. Here, using a scanning tunneling microscope tip, we demonstrate engineering of the energy levels of the YSR states by placing interstitial Fe atoms in close proximity to adsorbed Fe atoms on an oxidized Ta surface. Based on this prototype platform, we show that the interaction within a long chain can be strengthened by linking the adsorbed Fe atoms with the interstitial ones. Our work adds an important step towards the controlled design and manipulation of Majorana end states.
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spelling pubmed-60923632018-08-16 Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor Kamlapure, A. Cornils, L. Wiebe, J. Wiesendanger, R. Nat Commun Article Magnetic atoms on a superconductor give rise to Yu-Shiba-Rusinov (YSR) states within the superconducting energy gap. A spin chain of magnetic adatoms on an s-wave superconductor may lead to topological superconductivity accompanied by the emergence of Majorana modes at the chain ends. For their usage in quantum computation, it is a prerequisite to artificially assemble the chains and control the exchange couplings between the spins in the chain and in the substrate. Here, using a scanning tunneling microscope tip, we demonstrate engineering of the energy levels of the YSR states by placing interstitial Fe atoms in close proximity to adsorbed Fe atoms on an oxidized Ta surface. Based on this prototype platform, we show that the interaction within a long chain can be strengthened by linking the adsorbed Fe atoms with the interstitial ones. Our work adds an important step towards the controlled design and manipulation of Majorana end states. Nature Publishing Group UK 2018-08-14 /pmc/articles/PMC6092363/ /pubmed/30108221 http://dx.doi.org/10.1038/s41467-018-05701-8 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Kamlapure, A.
Cornils, L.
Wiebe, J.
Wiesendanger, R.
Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title_full Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title_fullStr Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title_full_unstemmed Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title_short Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
title_sort engineering the spin couplings in atomically crafted spin chains on an elemental superconductor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092363/
https://www.ncbi.nlm.nih.gov/pubmed/30108221
http://dx.doi.org/10.1038/s41467-018-05701-8
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