Figure 4
From: Suspending Effect on Low-Frequency Charge Noise in Graphene Quantum Dot
Normalization of the noise.
(a) A Coulomb peak obtained from a suspended graphene nanoribbon at VSD = 200 μV when back gate voltage ranges from VBG = 4.283 V to VBG = 4.297 V. (b) The derivative of the current, |dI/dV|, of the peak shown in (a). (c) The current fluctuation ΔI of the peak shown in (a), as a function of back gate voltage VBG. To avoid inaccuracy, we only used the data points between two dotted lines in (a), (b) and (c) for calculating the potential fluctuation Δε. (d) A Coulomb peak obtained from an unsuspended graphene nanoribbon. Back gate voltage ranges from VBG = 1.014 V to VBG = 1.029 V where VSD = 350 μV. (e) The derivative of the current of the peak shown in (d). (f) The current fluctuation ΔI of the peak shown in (d) as a function of back gate voltage VBG.
