Nature Communications (Jun 2022)
Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene
Abstract
Previous studies of twisted double bilayer graphene have been limited to AB-AB stacking, featuring spin-polarized correlated insulators. Here, the authors fabricate AB-BA devices and report a competition between spin and valley polarization, along with the emergence of valley-polarized correlated insulators tuned by electric field.