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Fragility of surface states in topological superfluid 3He

Author

Listed:
  • P. J. Heikkinen

    (Royal Holloway University of London)

  • A. Casey

    (Royal Holloway University of London)

  • L. V. Levitin

    (Royal Holloway University of London)

  • X. Rojas

    (Royal Holloway University of London)

  • A. Vorontsov

    (Montana State University)

  • P. Sharma

    (Indian Institute of Science)

  • N. Zhelev

    (Cornell University)

  • J. M. Parpia

    (Cornell University)

  • J. Saunders

    (Royal Holloway University of London)

Abstract

Superfluid 3He, with unconventional spin-triplet p-wave pairing, provides a model system for topological superconductors, which have attracted significant interest through potential applications in topologically protected quantum computing. In topological insulators and quantum Hall systems, the surface/edge states, arising from bulk-surface correspondence and the momentum space topology of the band structure, are robust. Here we demonstrate that in topological superfluids and superconductors the surface Andreev bound states, which depend on the momentum space topology of the emergent order parameter, are fragile with respect to the details of surface scattering. We confine superfluid 3He within a cavity of height D comparable to the Cooper pair diameter ξ0. We precisely determine the superfluid transition temperature Tc and the suppression of the superfluid energy gap, for different scattering conditions tuned in situ, and compare to the predictions of quasiclassical theory. We discover that surface magnetic scattering leads to unexpectedly large suppression of Tc, corresponding to an increased density of low energy bound states.

Suggested Citation

  • P. J. Heikkinen & A. Casey & L. V. Levitin & X. Rojas & A. Vorontsov & P. Sharma & N. Zhelev & J. M. Parpia & J. Saunders, 2021. "Fragility of surface states in topological superfluid 3He," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21831-y
    DOI: 10.1038/s41467-021-21831-y
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    Cited by:

    1. M. Lucas & A. V. Danilov & L. V. Levitin & A. Jayaraman & A. J. Casey & L. Faoro & A. Ya. Tzalenchuk & S. E. Kubatkin & J. Saunders & S. E. de Graaf, 2023. "Quantum bath suppression in a superconducting circuit by immersion cooling," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. T. Kamppinen & J. Rysti & M.-M. Volard & G. E. Volovik & V. B. Eltsov, 2023. "Topological nodal line in superfluid 3He and the Anderson theorem," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Samuli Autti & Richard P. Haley & Asher Jennings & George R. Pickett & Malcolm Poole & Roch Schanen & Arkady A. Soldatov & Viktor Tsepelin & Jakub Vonka & Vladislav V. Zavjalov & Dmitry E. Zmeev, 2023. "Transport of bound quasiparticle states in a two-dimensional boundary superfluid," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    4. S. Autti & P. J. Heikkinen & J. Nissinen & J. T. Mäkinen & G. E. Volovik & V. V. Zavyalov & V. B. Eltsov, 2022. "Nonlinear two-level dynamics of quantum time crystals," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    5. Y. Tian & D. Lotnyk & A. Eyal & K. Zhang & N. Zhelev & T. S. Abhilash & A. Chavez & E. N. Smith & M. Hindmarsh & J. Saunders & E. Mueller & J. M. Parpia, 2023. "Supercooling of the A phase of 3He," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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