Tunable quantum interferometer for correlated moiré electrons

Shuichi Iwakiri (), Alexandra Mestre-Torà (), Elías Portolés, Marieke Visscher, Marta Perego, Giulia Zheng, Takashi Taniguchi, Kenji Watanabe, Manfred Sigrist, Thomas Ihn and Klaus Ensslin
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Shuichi Iwakiri: ETH Zurich
Alexandra Mestre-Torà: ETH Zurich
Elías Portolés: ETH Zurich
Marieke Visscher: ETH Zurich
Marta Perego: ETH Zurich
Giulia Zheng: ETH Zurich
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Manfred Sigrist: ETH Zurich
Thomas Ihn: ETH Zurich
Klaus Ensslin: ETH Zurich

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Magic-angle twisted bilayer graphene can host a variety of gate-tunable correlated states – including superconducting and correlated insulator states. Recently, junction-based superconducting moiré devices have been introduced, enabling the study of the charge, spin and orbital nature of superconductivity, as well as the coherence of moiré electrons in magic-angle twisted bilayer graphene. Complementary fundamental coherence effects—in particular, the Little–Parks effect in a superconducting ring and the Aharonov–Bohm effect in a normally conducting ring – have not yet been reported in moiré devices. Here, we observe both phenomena in a single gate-defined ring device, where we can embed a superconducting or normally conducting ring in a correlated or band insulator. The Little–Parks effect is seen in the superconducting phase diagram as a function of density and magnetic field, confirming the effective charge of 2e. We also find that the coherence length of conducting moiré electrons exceeds several microns at 50 mK. In addition, we identify a regime characterized by h/e-periodic oscillations but with superconductor-like nonlinear transport.

Date: 2024
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DOI: 10.1038/s41467-023-44671-4

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