Year: 2025
Type: article
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: Physical Review Letters
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: European Commission, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, QuantERA, Horizon 2020 Framework Programme, Swiss Nanoscience Institute, European Research Council, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Core Research for Evolutional Science and Technology
Awards: G1110416008, G3406638862, G3510308925, G369169853, G434337789, G5271502856, G575169067, QuantERA II ERA-NET Cofund in Quantum Technologies, G5922164040, G6664495284, G6718509927, Unambiguous identification of the topological order of the quantum Hall states, G7879866177, Synthesis of high quality single crystals for sience of Boron Nitride
OpenAlex ID: W4410775626