Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W09: Superconductivity in Magic Angle Moiré Graphene Stacks
3:00 PM–6:00 PM,
Thursday, March 7, 2024
Room: L100J
Sponsoring
Unit:
DCMP
Chair: Chunli Huang, University of Kentucky
Abstract: W09.00002 : Superfluid and Quasiparticle Dynamics of Magic-Angle Twisted Bilayer Graphene I
3:12 PM–3:24 PM
Presenter:
Pavel A Volkov
(University of Connecticut)
Authors:
Pavel A Volkov
(University of Connecticut)
Elías Portolés
(ETH Zurich)
Marta Perego
(ETH Zurich)
Jed H Pixley
(Rutgers University)
Klaus Ensslin
(ETH Zurich)
Thomas Ihn
(ETH Zurich)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Shuichi Iwakiri
(ETH Zurich)
Giulia Zheng
(ETH Zurich)
Alexandra Mestre-Tora
(ETH Zurich)
We present a model to demonstrate that the dynamical properties of gate-defined Josephson junctions in MATBG give access to intrinsic properties of MATBG. We have probed the dynamics of MATBG by biasing the gate-defined junctions with DC and AC currents. The resulting current-voltage characteristics are hysteretic and depend both on frequency and the gate voltage, with the effect of AC drive suppressed with frequency. From our numerical simulations, we attribute the frequency dependence of the response to thermal relaxation of the Joule heated electrons in the junctions and the reactive impedance of the superfluid in MATBG. Our model of junction dynamics based on these mechanisms is shown to describe well the experimental data and allows to access the electron-phonon cooling power, electronic specific heat and superfluid density of MATBG. This analysis establishes a new method to experimentally probe the intrinsic properties of superconducting 2D materials.
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