Topological superconductivity in magnetic adatom lattices
Topological matter has emerged as one of the most prominent research fronts in condensed matter physics over the past three decades. The discovery of the role of topology in materials has shaped our fundamental understanding of how the constituents of matter organize themselves to produce various ph...
Published in: | Physical Review B |
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Aalto University
2016
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Online Access: | https://aaltodoc.aalto.fi/handle/123456789/20612 |
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Aalto University Publication Archive (Aaltodoc) |
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ftaaltouniv |
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English |
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Physics topological matter topological superconductivity Majorana modes topologiset materiaalit topologinen suprajohtavuus Majorana-tilat |
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Physics topological matter topological superconductivity Majorana modes topologiset materiaalit topologinen suprajohtavuus Majorana-tilat Röntynen, Joel Topological superconductivity in magnetic adatom lattices |
topic_facet |
Physics topological matter topological superconductivity Majorana modes topologiset materiaalit topologinen suprajohtavuus Majorana-tilat |
description |
Topological matter has emerged as one of the most prominent research fronts in condensed matter physics over the past three decades. The discovery of the role of topology in materials has shaped our fundamental understanding of how the constituents of matter organize themselves to produce various phases. Topology in these systems manifests as boundary states and exotic quasiparticles, whose intriguing properties are anticipated to facilitate various technological applications. In this thesis I have contributed to the search for topological superconductivity, which is expected to support localized, particle-like excitations called Majorana bound states. Majorana bound states break the dichotomy of bosons and fermions by obeying non-Abelian exchange statistics. Hence a Majorana bound state would be a manifestation of a fundamentally new type of physics. Furthermore, Majorana braiding is envisioned to be utilized in topologically protected quantum computing, which could revolutionize the future of computing. The experimental discovery of Majorana bound states is an outstanding goal in condensed matter physics at the moment. The systems investigated in this thesis consists of magnetic adsorbed atoms (adatoms) deposited on top of a conventional superconductor. In publications I and II we investigated the appearance of Majorana bound states in adatom chains. The main result in publication I is that coupled chains are more likely to exhibit Majorana bound states than uncoupled chains. In publication II we showed that a supercurrent can be used to control the topological phase, which could be helpful for the manipulation of Majorana bound states. In publications III and IV we showed that two-dimensional adatom structures support a generalization of px+ipy superconductivity, making it an interesting addition to the list of materials with unconventional superconductivity. The complex, mosaic-like structure of the topological phase diagram is remarkably rich due to long-range electron hopping. The number of propagating ... |
author2 |
Ojanen, Teemu, Dr., Aalto University, Department of Applied Physics, Finland Perustieteiden korkeakoulu School of Science Teknillisen fysiikan laitos Department of Applied Physics Hakonen, Pertti, Prof., Aalto University, Department of Applied Physics, Finland Aalto-yliopisto Aalto University |
format |
Doctoral or Postdoctoral Thesis |
author |
Röntynen, Joel |
author_facet |
Röntynen, Joel |
author_sort |
Röntynen, Joel |
title |
Topological superconductivity in magnetic adatom lattices |
title_short |
Topological superconductivity in magnetic adatom lattices |
title_full |
Topological superconductivity in magnetic adatom lattices |
title_fullStr |
Topological superconductivity in magnetic adatom lattices |
title_full_unstemmed |
Topological superconductivity in magnetic adatom lattices |
title_sort |
topological superconductivity in magnetic adatom lattices |
publisher |
Aalto University |
publishDate |
2016 |
url |
https://aaltodoc.aalto.fi/handle/123456789/20612 |
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IPY |
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IPY |
op_relation |
Aalto University publication series DOCTORAL DISSERTATIONS 111/2016 [Publication 1]: Kim Pöyhönen, Alex Westström, Joel Röntynen, and Teemu Ojanen. Majorana states in helical Shiba chains and ladders. Physical Review B, 89,115109, March 2014. DOI:10.1103/PhysRevB.89.115109 [Publication 2]: Joel Röntynen and Teemu Ojanen. Tuning topological superconductivity in helical Shiba chains by supercurrent. Physical Review B, 90, 180503(R), November 2014. DOI:10.1103/PhysRevB.90.180503 [Publication 3]: Joel Röntynen and Teemu Ojanen. Topological Superconductivity and High Chern Numbers in 2D Ferromagnetic Shiba Lattices. Physical Review Letters, 114, 236803, June 2015. DOI:10.1103/PhysRevLett.114.236803 [Publication 4]: Joel Röntynen and Teemu Ojanen. Chern mosaic - topology of chiral superconductivity on ferromagnetic adatom lattices. Physical Review B, 93,094521, March 2016. DOI:10.1103/PhysRevB.93.094521 978-952-60-6852-7 (electronic) 978-952-60-6851-0 (printed) 1799-4942 (electronic) 1799-4934 (printed) 1799-4934 (ISSN-L) https://aaltodoc.aalto.fi/handle/123456789/20612 URN:ISBN:978-952-60-6852-7 |
op_doi |
https://doi.org/10.1103/PhysRevB.89.115109 https://doi.org/10.1103/PhysRevB.90.180503 https://doi.org/10.1103/PhysRevLett.114.236803 https://doi.org/10.1103/PhysRevB.93.094521 |
container_title |
Physical Review B |
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89 |
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11 |
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1766046914211479552 |
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ftaaltouniv:oai:aaltodoc.aalto.fi:123456789/20612 2023-05-15T16:55:52+02:00 Topological superconductivity in magnetic adatom lattices Topologinen suprajohtavuus magneettisissa atomihiloissa Röntynen, Joel Ojanen, Teemu, Dr., Aalto University, Department of Applied Physics, Finland Perustieteiden korkeakoulu School of Science Teknillisen fysiikan laitos Department of Applied Physics Hakonen, Pertti, Prof., Aalto University, Department of Applied Physics, Finland Aalto-yliopisto Aalto University 2016 application/pdf https://aaltodoc.aalto.fi/handle/123456789/20612 en eng Aalto University Aalto-yliopisto Aalto University publication series DOCTORAL DISSERTATIONS 111/2016 [Publication 1]: Kim Pöyhönen, Alex Westström, Joel Röntynen, and Teemu Ojanen. Majorana states in helical Shiba chains and ladders. Physical Review B, 89,115109, March 2014. DOI:10.1103/PhysRevB.89.115109 [Publication 2]: Joel Röntynen and Teemu Ojanen. Tuning topological superconductivity in helical Shiba chains by supercurrent. Physical Review B, 90, 180503(R), November 2014. DOI:10.1103/PhysRevB.90.180503 [Publication 3]: Joel Röntynen and Teemu Ojanen. Topological Superconductivity and High Chern Numbers in 2D Ferromagnetic Shiba Lattices. Physical Review Letters, 114, 236803, June 2015. DOI:10.1103/PhysRevLett.114.236803 [Publication 4]: Joel Röntynen and Teemu Ojanen. Chern mosaic - topology of chiral superconductivity on ferromagnetic adatom lattices. Physical Review B, 93,094521, March 2016. DOI:10.1103/PhysRevB.93.094521 978-952-60-6852-7 (electronic) 978-952-60-6851-0 (printed) 1799-4942 (electronic) 1799-4934 (printed) 1799-4934 (ISSN-L) https://aaltodoc.aalto.fi/handle/123456789/20612 URN:ISBN:978-952-60-6852-7 Physics topological matter topological superconductivity Majorana modes topologiset materiaalit topologinen suprajohtavuus Majorana-tilat G5 Artikkeliväitöskirja text Doctoral dissertation (article-based) Väitöskirja (artikkeli) 2016 ftaaltouniv https://doi.org/10.1103/PhysRevB.89.115109 https://doi.org/10.1103/PhysRevB.90.180503 https://doi.org/10.1103/PhysRevLett.114.236803 https://doi.org/10.1103/PhysRevB.93.094521 2022-12-15T19:15:14Z Topological matter has emerged as one of the most prominent research fronts in condensed matter physics over the past three decades. The discovery of the role of topology in materials has shaped our fundamental understanding of how the constituents of matter organize themselves to produce various phases. Topology in these systems manifests as boundary states and exotic quasiparticles, whose intriguing properties are anticipated to facilitate various technological applications. In this thesis I have contributed to the search for topological superconductivity, which is expected to support localized, particle-like excitations called Majorana bound states. Majorana bound states break the dichotomy of bosons and fermions by obeying non-Abelian exchange statistics. Hence a Majorana bound state would be a manifestation of a fundamentally new type of physics. Furthermore, Majorana braiding is envisioned to be utilized in topologically protected quantum computing, which could revolutionize the future of computing. The experimental discovery of Majorana bound states is an outstanding goal in condensed matter physics at the moment. The systems investigated in this thesis consists of magnetic adsorbed atoms (adatoms) deposited on top of a conventional superconductor. In publications I and II we investigated the appearance of Majorana bound states in adatom chains. The main result in publication I is that coupled chains are more likely to exhibit Majorana bound states than uncoupled chains. In publication II we showed that a supercurrent can be used to control the topological phase, which could be helpful for the manipulation of Majorana bound states. In publications III and IV we showed that two-dimensional adatom structures support a generalization of px+ipy superconductivity, making it an interesting addition to the list of materials with unconventional superconductivity. The complex, mosaic-like structure of the topological phase diagram is remarkably rich due to long-range electron hopping. The number of propagating ... Doctoral or Postdoctoral Thesis IPY Aalto University Publication Archive (Aaltodoc) Physical Review B 89 11 |