aalto1 untyped-item.component.html
Topological nodal line in superfluid 3He and the Anderson theorem
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Date
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
Series
Nature Communications, Volume 14, issue 1, pp. 1-9
Abstract
Superconductivity and superfluidity with anisotropic pairing—such as d-wave in cuprates and p-wave in superfluid 3He—are strongly suppressed by impurities. Meanwhile, for applications, the robustness of Cooper pairs to disorder is highly desired. Recently, it has been suggested that unconventional systems become robust if the impurity scattering mixes quasiparticle states only within individual subsystems obeying the Anderson theorem that protects conventional superconductivity. Here, we experimentally verify this conjecture by measuring the temperature dependence of the energy gap in the polar phase of superfluid 3He. We show that oriented columnar non-magnetic defects do not essentially modify the energy spectrum, which has a Dirac nodal line. Although the scattering is strong, it preserves the momentum along the length of the columns and forms robust subsystems according to the conjecture. This finding may stimulate future experiments on the protection of topological superconductivity against disorder and on the nature of topological fermionic flat bands.
Description
Funding Information: We thank Igor Fomin for discussions and Vladimir Dmitriev for providing nafen-243 sample. This work has been supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 694248), by Academy of Finland (grant 332964), and additionally by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 824109. The experiments were performed at the Low Temperature Laboratory, which is a part of the OtaNano research infrastructure of Aalto University and of the European Microkelvin Platform. T.K. acknowledges support from the Finnish Cultural foundation. | openaire: EC/H2020/694248/EU//TOPVAC | openaire: EC/H2020/824109/EU//EMP
Keywords
Other note
Citation
Kamppinen, T, Rysti, J, Volard, M M, Volovik, G E & Eltsov, V B 2023, 'Topological nodal line in superfluid 3 He and the Anderson theorem', Nature Communications, vol. 14, no. 1, 4276, pp. 1-9. https://doi.org/10.1038/s41467-023-39977-2