| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Properties of Graphene Based Parametric Pump |
| LUO Song-Lin, WEI Ya-Dong |
| College of Physics Science and Technology and Institute of Computational Condensed Matter Physics, Shenzhen University, Shenzhen 518060 |
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| Cite this article: |
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LUO Song-Lin, WEI Ya-Dong 2009 Chin. Phys. Lett. 26 117202 |
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Abstract 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 Φ=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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| Keywords:
72.10.Bg
73.63.-b
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Received: 06 August 2009
Published: 30 October 2009
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| PACS: |
72.10.Bg
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(General formulation of transport theory)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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