| Title: |
Quasiparticle and superfluid dynamics in Magic-Angle Graphene |
| Authors: |
Portolés, Elías; Perego, Marta; Volkov, Pavel A.; Toschini, Mathilde; Kemna, Yana; Mestre-Torà, Alexandra; Zheng, Giulia; Denisov, Artem; id_orcid:0 000-0001-9095-1579; de Vries, Folkert K.; Rickhaus, Peter; Taniguchi, Takashi; Watanabe, Kenji; Pixley, J.H.; Ihn, Thomas Markus; Ensslin, Klaus |
| Source: |
Nature Communications, 16 (1) |
| Publisher Information: |
Nature |
| Publication Year: |
2025 |
| Collection: |
ETH Zürich Research Collection |
| Description: |
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. ; ISSN:2041-1723 |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/application/pdf |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/wos/001485497400003; info:eu-repo/grantAgreement/EC/H2020/951541; info:eu-repo/grantAgreement/EC/H2020/862660; info:eu-repo/grantAgreement/SNF/NCCR (NFS)/185902; https://hdl.handle.net/20.500.11850/735600 |
| DOI: |
10.3929/ethz-b-000735600 |
| Availability: |
https://hdl.handle.net/20.500.11850/735600; https://doi.org/10.3929/ethz-b-000735600 |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by-nc-nd/4.0/ ; Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International |
| Accession Number: |
edsbas.F2DD1198 |
| Database: |
BASE |