Gate-Tunable Orbital Magnetism and Competing Superconductivity in Twisted Trilayer Graphene Josephson Junctions.

ABSTRACT: Twisted trilayer graphene (TTG) provides a tunable moiré platform to study correlated phases emerging from flat-band physics. Here, we investigate the interplay between superconductivity and spontaneous orbital magnetism (OM) in alternating TTG devices with intermediate twist angles (1.38-1.44°). Using electrostatically defined Josephson junctions, we demonstrate that OM, stabilized near the charge neutrality point (CNP), competes with gate-induced superconductivity. The OM phase is characterized by sharp jumps in Hall resistance, current-induced bistability, and a Curie-Bloch temperature dependence, indicating broken time-reversal symmetry. Additionally, nonreciprocal Josephson transport─manifested as asymmetric Fraunhofer patterns and a superconducting diode effect─provides independent e

SUBMITTER: Bhardwaj V 

PROVIDER: S-EPMC12754749 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature