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: W09.00003 : Superfluid and Quasiparticle Dynamics of Magic-Angle Twisted Bilayer Graphene II
3:24 PM–3:36 PM
Presenter:
Elías Portolés
(ETH Zurich)
Authors:
Elías Portolés
(ETH Zurich)
Pavel A Volkov
(University of Connecticut)
Marta Perego
(ETH Zurich)
Alexandra Mestre-Tora
(ETH Zurich)
Shuichi Iwakiri
(ETH Zurich)
Giulia Zheng
(ETH Zurich)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(Kyoto Univ)
Jed H Pixley
(Rutgers University)
Thomas Ihn
(ETH Zurich)
Klaus Ensslin
(ETH Zurich)
We analyze the properties of MATBG measured with gate-defined, radio frequency-biased, Josephson junctions. We bias our junction with both DC and AC current and observe a frequency-dependent drift in the retrapping and switching critical currents of the hysteretic current-voltage characteristic. The frequency scales for the retrapping and switching contain information about quasiparticle specific heat, electron-phonon coupling as well as superfluid stiffness. Changing the junction gate voltage allows us to probe these properties across the phase diagram of MATBG. The results give direct evidence for large electron-phonon coupling in the flat bands of MATBG but favor strongly anisotropic or nodal pairing.
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