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Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Twisted Materials / Systems

TT 44.1: Vortrag

Mittwoch, 20. März 2024, 11:30–11:45, H 3007

Large tunable kinetic inductance in a graphene based superconductorRounak Jha1,2, Martin Endres1, Kenji Watanabe3, Takashi Taniguchi4, Mitali Banerjee2, Christian Schönenberger1,5, and •Paritosh Karnatak11Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2Laboratory of Quantum Physics (LQP), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — 3Research Center for Functional Materials, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan — 4International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan — 5Swiss Nanoscience Institute, University of Basel, CH-4056 Basel, Switzerland

Graphene based twisted moiré heterostructures host a flat band at the magic angle where the kinetic energy of charge carriers is quenched and interaction effects dominate. This results in emergent phases such as correlated insulators and superconductors that are electrostatically tunable. In this work, we investigate superconductivity in magic angle twisted trilayer graphene (MATTG) by integrating it as a weak link in a SQUID (superconducting quantum interference device) loop of superconducting Molybdenum Rhenium. We study the current phase relation of MATTG in various configurations and show that superconducting MATTG has a large kinetic inductance up to 75 nH per square which is electrostatically tunable. This opens avenues for using MATTG as a tunable element in superconducting circuits.

Keywords: graphene; kinetic inductance; superconductivity; moiré; superconducting circuits

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