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Vortex dynamics in the two-dimensional BCS-BEC crossover

Author

Listed:
  • Max Heyl

    (University of Tokyo
    Humboldt-Universität zu Berlin, Zum Großen Windkanal 2)

  • Kyosuke Adachi

    (RIKEN Center for Biosystems Dynamics Research
    RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program)

  • Yuki M. Itahashi

    (University of Tokyo)

  • Yuji Nakagawa

    (University of Tokyo)

  • Yuichi Kasahara

    (Kyoto University, Kitashirakawa Oiwakecho)

  • Emil J. W. List-Kratochvil

    (Humboldt-Universität zu Berlin, Zum Großen Windkanal 2
    Helmholtz-Zentrum für Materialien und Energie GmbH, Hahn-Meitner-Platz 1)

  • Yusuke Kato

    (University of Tokyo)

  • Yoshihiro Iwasa

    (University of Tokyo
    RIKEN, Center for Emergent Matter Science)

Abstract

The Bardeen–Cooper–Schrieffer (BCS) condensation and Bose–Einstein condensation (BEC) are the two limiting ground states of paired Fermion systems, and the crossover between these two limits has been a source of excitement for both fields of high temperature superconductivity and cold atom superfluidity. For superconductors, ultra-low doping systems like graphene and LixZrNCl successfully approached the crossover starting from the BCS-side. These superconductors offer new opportunities to clarify the nature of charged-particles transport towards the BEC regime. Here we report the study of vortex dynamics within the crossover using their Hall effect as a probe in LixZrNCl. We observed a systematic enhancement of the Hall angle towards the BCS-BEC crossover, which was qualitatively reproduced by the phenomenological time-dependent Ginzburg-Landau (TDGL) theory. LixZrNCl exhibits a band structure free from various electronic instabilities, allowing us to achieve a comprehensive understanding of the vortex Hall effect and thereby propose a global picture of vortex dynamics within the crossover. These results demonstrate that gate-controlled superconductors are ideal platforms towards investigations of unexplored properties in BEC superconductors.

Suggested Citation

  • Max Heyl & Kyosuke Adachi & Yuki M. Itahashi & Yuji Nakagawa & Yuichi Kasahara & Emil J. W. List-Kratochvil & Yusuke Kato & Yoshihiro Iwasa, 2022. "Vortex dynamics in the two-dimensional BCS-BEC crossover," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34756-x
    DOI: 10.1038/s41467-022-34756-x
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    References listed on IDEAS

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