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説明:

Elucidating the character and origin of correlated states in 2D materials presents an outstanding experimental challenge, with most conventional probes not applicable. Here, we demonstrate the use of non-equilibrium, dynamical experiments, to characterize the low-temperature electronic states of Magic-Angle Twisted Bilayer Graphene (MATBG). We use a gate-defined, radio frequency-biased, Josephson junction to probe the electronic dynamics of the material at tunable electron density and cryogenic temperatures. We find relaxational dynamics of supercurrent with rates of the order of few MHz throughout the phase diagram. These rates are attributed to thermalization of quasiparticles via electron-phonon interactions and inductive response of the Cooper pair condensate. We develop a model of the junction response allowing to deduce electron-phonon coupling, kinetic inductance and specific heat of MATBG from the data. The results favor highly anisotropic or nodal super- conductivity and establish an easy-to-implement method for characterizing thermal and superfluid properties of superconducting 2D materials.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: magic-angle graphene (MATBG)
, quasiparticle dynamics
, superfluid dynamics

刊行年月日: 2025-05-08

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 16 issue. 1 4273

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-025-58325-0

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更新時刻: 2026-05-25 08:54:11 +0900

MDRでの公開時刻: 2026-05-25 10:29:21 +0900