Fig. 5
From: Observing a scale anomaly and a universal quantum phase transition in graphene
Behavior of the energies E n (β) of the quasi-bound state spectrum. The curves are obtained from (2) for E 1(β), \(E_1^\prime \)(β), E 2(β) as adapted to the massless Dirac case. The black and cyan dots correspond to the values measured in graphene. The two pink x’s are the values of Efimov energies measured in Caesium atoms39, 47, which corresponds to the (overcritical) fixed Efimov value β E = 1.1236. Additional experimental points obtained in refs 40, 41 are displayed in the inset
