Pays.org January 30, 2023
Superconducting FETs operate through continuous tuning of carrier density, but no bistable superconducting FET, which could serve as a new type of cryogenic memory element, has been reported. Recently, gate hysteresis and resultant bistability in Bernal-stacked bilayer graphene aligned to its insulating hexagonal boron nitride gate dielectrics were discovered. An international team of researchers (USA- MIT, Israel) reported the observation of hysteresis in magic-angle twisted bilayer graphene (MATBG) with aligned boron nitride layers. The bistable behaviour coexists alongside the strongly correlated electron system of MATBG without disrupting its correlated insulator or superconducting states. The all-van der Waals platform enables configurable switching between different electronic states of this rich system. To illustrate this new approach, they demonstrated reproducible bistable switching between the superconducting, metallic and correlated insulator states of MATBG using gate voltage or electric displacement field. According to the researchers their experiments unlock the potential to broadly incorporate this new switchable moiré superconductor into highly tunable superconducting electronics…read more. TECHNICAL ARTICLE
Device characterization. CREDIT: Nature Nanotechnology (2023)