| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Single-Parameter Quantum Pumping in Graphene Nanoribbons with Staggered Sublattice Potential |
| Yan-Hua Li, Yong-Jian Xiong** |
Department of Physics, Ningbo University, Ningbo 315211
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| Cite this article: |
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Yan-Hua Li, Yong-Jian Xiong 2017 Chin. Phys. Lett. 34 057201 |
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Abstract We present a theoretical study of quantum charge pumping in metallic armchair graphene nanoribbons using the Floquet–Green function method. A central part of the ribbon acting as the scattering region is supposed to have staggered sublattice potential to open a finite band gap. A single ac gate is asymmetrically applied to a part of the scattering region to drive the pumping. Corresponding to the gap edges, there are two pumped current peaks with opposite current directions, which can be reversed by changing the position of the ac gate relative to the scattering region. The effects of the parameters, such as the staggered sublattice potential, the driving frequency and the geometric parameters of the structure, on the pumping are discussed.
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Received: 04 February 2017
Published: 29 April 2017
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| PACS: |
72.80.Vp
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(Electronic transport in graphene)
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73.23.-b
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(Electronic transport in mesoscopic systems)
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73.23.Ad
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(Ballistic transport)
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| Fund: Supported by the K. C. Wong Magna Fund in Ningbo University, and the National Natural Science Foundation of China under Grant No 11474174. |
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