2b shows the variation of the spin polarization, SP, with the frequency of the induced photon at different values of gate voltage
where [V.sub.GS] is the DC gate voltage
and A is the magnitude of the applied input voltage.
The phase shift across a set of components ([C.sub.L], [C.sub.R], [C.sub.gsp], [L.sub.R]) is 90[degrees] so that the phase shift of the coupling varactor-inductor loop is 360[degrees] and the waveforms of gate voltages
(and drain voltages) of pMOSFETs are quadrature.
Figure 4 on the right also shows the current-voltage characteristics of the OPV7 molecule with oxygen linkers at different gate voltages
. N-type behavior in conduction can be observed as the positive gate voltage
enhances the current .
In the measurement, the G-FET device was provided with a varying gate voltage
[V.sub.gs] from -0.6 to 0.6 V with the scanning step of 0.025 V by an Ag/AgCl electrode and a constant voltage of 0.01 V was provided between drain and source electrodes.
To begin the analysis we decompose the total and constant gate voltage
drop, [V.sub.GC], into several contributions: (1) [V.sub.FB], the flat-band voltage drop arising from the difference in Fermi level between the n-doped MESFET channel and the p-type substrate which is assumed constant with temperature, (2) [V.sub.COx], the potential difference between the channel and the BOX alluded to previously, (3) AV, the capacitive voltage drop on the BOX, and (4) [[phi].sub.dep], the voltage drop through the depletion region of the substrate.
5(a), it is clear that extrapolating the nonlinear [C.sub.iss] values based solely on a 2D plot at a certain drain or gate voltage
would be inappropriate, because the nonlinear [C.sub.iss] can either increase or decrease at different drain or gate voltages
The gate-source capacitance ([C.sub.gs]) is defined as the change in total charge with the change in gate voltage
. It is mainly due to the 2DEG in the normal operating region and is given as
In general, the drain current, [I.sub.D], as a function of the drain voltage, [V.sub.D], and gate voltage
, [V.sub.GS] is given by
Hence, the gate voltage
of the DTFT connected to the signal holding capacitor [C.sub.s] is also reset for initialization.
This property is due to the finite-size effect and geometry of the zigzag-edge graphene nanoribbons, Saffarzadeh explains."By applying a gate voltage
, the type of spin current can be switched from spin-up to spin-down or vice versa," Saffarzadeh says.
The Fano factor F Eq.(9) has been computed numerically as a function of the gate voltage
[V.sub.g] magnetic field B and function of the frequency [[omega].sub.Soc] due to spin-orbit coupling.