Quasiparticle and superfluid dynamics in Magic-Angle Graphene
OPEN ACCESS
Loading...
Author / Producer
Date
2025-05-08
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
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.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
16 (1)
Pages / Article No.
4273
Publisher
Nature
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03439 - Ensslin, Klaus / Ensslin, Klaus
08835 - Ihn, Thomas (Tit.-Prof.)
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Notes
Funding
951541 - Entropy in engineered quantum systems — Mesoscopic thermodynamics of correlated quantum states (EC)
862660 - Toward new era of quantum electrical measurements through phase slips (EC)
185902 - QSIT - Quantum Science and Technology (SNF)
862660 - Toward new era of quantum electrical measurements through phase slips (EC)
185902 - QSIT - Quantum Science and Technology (SNF)
Related publications and datasets
Is cited by: https://doi.org/10.3929/ethz-c-000782840