Luo Song-Lin and Wei Ya-Dong 2009 Chinese Phys. Lett. 26 117202 doi:10.1088/0256-307X/26/11/117202
Properties of Graphene Based Parametric Pump
Luo Song-Lin and Wei Ya-Dong
Show affiliationsCONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
The adiabatic parametric electron pump of the infinite zigzag graphene ribbons and the infinite armchair graphene ribbons is investigated by the tight binding method. The pumping signals are added by two gates around the ribbons. It is shown that the dc current can be pumped out by cyclically varying the two gate voltages and the pumped current strongly depends on the driving frequency, the pumping amplitude and the phase difference of the gate voltages. The pumped current is mediated by the graphene energy levels and its peaks occur around the energies where transmission coefficients and density of states are large. The pump current may give one peak or two opposite peaks corresponding to each transmission peak or transmission pair peaks. The height and width of the current peaks increase with the amplitude of the pumping driving voltages. The pumped current is antisymmetric about the phase difference 
= π and for small pumping amplitude the pumped current is a sinusoidal function of the phase difference. Some graphene ribbons, although with different widths, have very similar contours of the transmission coefficients and give the same pumped current figures.
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Issue 11 (November 2009)
Received 6 August 2009
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Properties of Graphene Based Parametric Pump
Luo Song-Lin and Wei Ya-Dong 2009 Chinese Phys. Lett. 26 117202
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