Fig. 3: Spectrum at fixed density.

a dI/dV vs. −V_Src and B, graphene density fixed at n_Gr = 3.1 × 10¹² cm⁻². Dashed regions mark N = 0 and N = 1 spectral features which show evidence of degeneracy lifting. b Simulation modelling the data at a. μ_Dot = 95 meV, d_Dot = 0.85 nm. Spectral features are marked by index pair: Injection/ejection level N_I and ground state N_G. Compressible and incompressible regimes are marked at the negative bias. c Energies of the split peaks of the N = 1 feature. d Energy difference of the features in c. Dashed line corresponds to g = 36. e Energies of the split peaks of the N = 0 feature. f Energy difference of the peaks in e. Blue: Valley split. Red: Spin split. Overlay lines trace two different slopes, corresponding to g = 100 and g = 160, respectively.