Universal moir\'e nematic phase in twisted graphitic systems

Understand

Graphene moir\'e superlattices display electronic flat bands.

• At integer fillings of these flat bands, energy gaps due to strong electron-electron interactions are generally observed.
• However, the presence of other correlation-driven phases in twisted graphitic systems at non-integer fillings is unclear.
• Here, we report scanning tunneling microscopy (STM) measurements that reveal the existence of threefold rotational (C3) symmetry breaking in twisted double bilayer graphene (tDBG).