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Fundamental dissipation due to bound fermions in the zero-temperature limit

Author

Listed:
  • S. Autti

    (Lancaster University)

  • S. L. Ahlstrom

    (Lancaster University)

  • R. P. Haley

    (Lancaster University)

  • A. Jennings

    (Lancaster University)

  • G. R. Pickett

    (Lancaster University)

  • M. Poole

    (Lancaster University)

  • R. Schanen

    (Lancaster University)

  • A. A. Soldatov

    (P.L. Kapitza Institute for Physical Problems of RAS)

  • V. Tsepelin

    (Lancaster University)

  • J. Vonka

    (Lancaster University
    Forschungsstrasse 111)

  • T. Wilcox

    (Lancaster University)

  • A. J. Woods

    (Lancaster University
    University of Florida)

  • D. E. Zmeev

    (Lancaster University)

Abstract

The ground state of a fermionic condensate is well protected against perturbations in the presence of an isotropic gap. Regions of gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show that in superfluid 3He the role of bound states is more subtle: when a macroscopic object moves in the superfluid at velocities exceeding the Landau critical velocity, little to no bulk pair breaking takes place, while the damping observed originates from the bound states covering the moving object. We identify two separate timescales that govern the bound state dynamics, one of them much longer than theoretically anticipated, and show that the bound states do not interact with bulk excitations.

Suggested Citation

  • S. Autti & S. L. Ahlstrom & R. P. Haley & A. Jennings & G. R. Pickett & M. Poole & R. Schanen & A. A. Soldatov & V. Tsepelin & J. Vonka & T. Wilcox & A. J. Woods & D. E. Zmeev, 2020. "Fundamental dissipation due to bound fermions in the zero-temperature limit," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18499-1
    DOI: 10.1038/s41467-020-18499-1
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    Cited by:

    1. 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.
    2. 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.

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