Extended Data Fig. 1: QPC conductance maps at 14 T.
From: A tunable Fabry–Pérot quantum Hall interferometer in graphene
a,b,c, Diagonal conductance GD versus split-gate voltages, VQPC, and back-gate voltages, Vbg, for the three QPCs of the device presented in the main text. During a measurement, only one QPC is studied and the two other sets of split gates are kept floating. The slope of the diagonal stripes corresponds to the capacitance ratio between the QPC constriction and the back gate. This slope is about twice/three times smaller than the zero-field slope of the charge neutrality point under the split-gate electrodes for QPC2 and QPC3, but is only slightly smaller for QPC1 (due to the unintentional absence of gap between the two electrodes of this QPC).
