A Wigner crystal, they realised a Wigner crystal. In the whole vulgarized article, they did not even use this official terminology once. I understand why, but I had to check the original article to make sure that's what they were talking about~~
Graphene, the gift that keeps on giving.
In a dilute two-dimensional electron gas, Coulomb interactions can stabilize the formation of a Wigner crystal. Although Wigner crystals are topologically trivial, it has been predicted that electrons in a partially filled band can break continuous translational symmetry and time-reversal symmetry spontaneously, resulting in a type of topological electron crystal known as an anomalous Hall crystal. Here we report signatures of a generalized version of the anomalous Hall crystal in twisted bilayer–trilayer graphene, whose formation is driven by the moiré potential.