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Quasiparticle and superfluid dynamics in Magic-Angle Graphene

Author

Listed:
  • Elías Portolés

    (ETH Zurich)

  • Marta Perego

    (ETH Zurich)

  • Pavel A. Volkov

    (University of Connecticut
    Harvard University)

  • Mathilde Toschini

    (ETH Zurich)

  • Yana Kemna

    (ETH Zurich)

  • Alexandra Mestre-Torà

    (ETH Zurich)

  • Giulia Zheng

    (ETH Zurich)

  • Artem O. Denisov

    (ETH Zurich)

  • Folkert K. de Vries

    (ETH Zurich)

  • Peter Rickhaus

    (ETH Zurich)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • J. H. Pixley

    (Rutgers University
    Flatiron Institute)

  • Thomas Ihn

    (ETH Zurich
    ETH Zurich)

  • Klaus Ensslin

    (ETH Zurich
    ETH Zurich)

Abstract

Magic-Angle Twisted Bilayer Graphene (MATBG) shows a wide range of correlated phases which are electrostatically tunable. Despite a growing knowledge of the material, there is yet no consensus on the microscopic mechanisms driving its superconducting phase. A major obstacle to progress in this direction is that key thermodynamic properties, such as specific heat, electron-phonon coupling and superfluid stiffness, are challenging to measure due to the 2D nature of the material and its relatively low energy scales. Here, we use a gate-defined, radio frequency-biased, Josephson junction to probe the electronic dynamics of MATBG. We demonstrate evidence for two processes determining the low-frequency dynamics across the phase diagram: thermalization of electronic quasiparticles through phonon scattering and inductive response of the superconducting condensate. A phenomenological approach allows us to relate the experimentally observed dynamics to several thermodynamic properties of MATBG, including electron-phonon coupling and superfluid stiffness. Our findings support anisotropic or nodal superconductivity in MATBG and demonstrate a broadly applicable method for studying properties of 2D materials with out-of-equilibrium nanodevice dynamics.

Suggested Citation

  • Elías Portolés & Marta Perego & Pavel A. Volkov & Mathilde Toschini & Yana Kemna & Alexandra Mestre-Torà & Giulia Zheng & Artem O. Denisov & Folkert K. de Vries & Peter Rickhaus & Takashi Taniguchi & , 2025. "Quasiparticle and superfluid dynamics in Magic-Angle Graphene," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58325-0
    DOI: 10.1038/s41467-025-58325-0
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    References listed on IDEAS

    as
    1. Asaf Rozen & Jeong Min Park & Uri Zondiner & Yuan Cao & Daniel Rodan-Legrain & Takashi Taniguchi & Kenji Watanabe & Yuval Oreg & Ady Stern & Erez Berg & Pablo Jarillo-Herrero & Shahal Ilani, 2021. "Entropic evidence for a Pomeranchuk effect in magic-angle graphene," Nature, Nature, vol. 592(7853), pages 214-219, April.
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