Figure 3
From: Negative Quantum Capacitance Induced by Midgap States in Single-layer Graphene

Magneto-capacitance Ctg measured at B = 8 T versus top gate voltage Vtg of the Ag-adsorbed single-layer graphene capacitor obtained at (a) T = 2 K (blue line), (b) T = 100 K (red line) and (c) T = 200 K (green line); the results measured at B = 0 T (dashed lines) are shown here for comparison.