Download file (1.59 MB)
Download as zip (1.04 MB)

Collection

Citation

Description:

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.

Rights:

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

Keyword: magic-angle graphene (MATBG)
, quasiparticle dynamics
, superfluid dynamics

Date published: 2025-05-08

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

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

Related item:

Other identifier(s):

Contact agent:

Updated at: 2026-05-25 08:54:11 +0900

Published on MDR: 2026-05-25 10:29:21 +0900