Fig. 3
From: Observing a scale anomaly and a universal quantum phase transition in graphene
Theoretical behavior of the low energy and scale-free part of the quasi-bound states spectrum in the overcritical regime for d = 2 and β = 1.2 > β c( = 1/2). The lower plot displays the detailed structure of the infinite geometric ladders. Note that the m = −1 (blue) and m = 0 (purple) ladders are intertwined. These results are independent of the boundary condition
