Large Tunable Kinetic Inductance in a Twisted Graphene Superconductor

Rounak Jha; Martin Endres; Kenji Watanabe; Takashi Taniguchi; Mitali Banerjee; Christian Schönenberger; Paritosh Karnatak

doi:10.1103/PhysRevLett.134.216001

Large Tunable Kinetic Inductance in a Twisted Graphene Superconductor

Rounak Jha, Martin Endres, Kenji Watanabe, Takashi Taniguchi, Mitali Banerjee, Christian Schönenberger, Paritosh Karnatak

DOI 10.1103/PhysRevLett.134.216001 · Physical Review Letters

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Abstract

Twisted graphene based moiré heterostructures host a flat band at the magic angles where the kinetic energy of the charge carriers is quenched and interaction effects dominate. This results in emergent phases such as superconductors and correlated insulators that are electrostatically tunable. We investigate superconductivity in twisted trilayer graphene by integrating it as the weak link in a superconducting quantum interference device. The measured current phase relation yields a large and tunable kinetic inductance, up to 150 nH per square, of the electron and hole-type intrinsic superconductors. We further show that the specific kinetic inductance and the critical current density are universally related via the superconducting coherence length, and extract an upper bound of ∼200 nm for the coherence length. We discuss the implications of a large coherence length in twisted graphene superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MoRe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown