Charge density texture in twisted multilayer graphene at low twist angles

In the chiral limit of the continuum model of twisted bilayer graphene (TBG), the band structure exhibits exactly flat bands at magic twist angles and the wave function exhibits an interesting nodal structure in real space. This work investigates how these properties persist when TBG is twisted away from magic angles and tuned away from the chiral model parameters to a more realistic limit. Specifically, we show that the charge density can exhibit an intra-cellular texture at smaller angles, which are distinct from the peaks seen at AA stacking points when near the first magic angle. Making use of an exact mapping to alternately twisted trilayer graphene (TTG), we show that the same charge density texture appears in TTG at larger angles, which provides a more viable experimental platform. We describe implications for future scanning tunnelling microscopy experiments.