Figure 6
From: Magneto-optical fingerprints of distinct graphene multilayers using the giant infrared Kerr effect
(a,b) Measured (solid, colored curves) complex Kerr angle at Eph = 130 meV, which is consistent with theoretical calculation (black, dotted curves) of the complex Kerr response for monolayer graphene systems without electron-hole band asymmetry. (c,d) Absence of CR features in measured complex Kerr angle at Eph = 224 meV, which is not consistent with expectations for a band asymmetric graphene system. Black curves are calculations of MIR Kerr response for graphene on SiC with different band asymmetries of 2.00% (solid curve), 1.0% (dashed curve) and 0.5% (dotted curve). The noise of the measurement is sufficiently small to detect the presence of a 0.5% asymmetry if it were present. (e) Plot of the Fermi energy limits 
and 
for activation of CR Kerr features for Eph = 120 meV and 224 mV. At Eph = 224 meV the 
and 
LLs are well above EF and are not occupied, which leads to a null Kerr response since 
. (f) Calculation of the weakening of the MIR Kerr angle response in a band symmetric monolayer graphene system for −1 → 2 CR transition as Eph deviates from Eph,optimal = 2EF.
