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Electron tunneling in single layer graphene with an energy gap |
Xu Xu-Guang(徐旭光)a), Zhang Chao(张潮) b), Xu Gong-Jie(徐公杰)a), and Cao Jun-Cheng(曹俊诚)a)† |
a Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; b School of Engineering Physics, University of Wollongong, New South Wales 2522, Australia |
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Abstract When a single layer graphene is epitaxially grown on silicon carbide, it will exhibit a finite energy gap like a conventional semiconductor, and its energy dispersion is no longer linear in momentum in the low energy regime. In this paper, we have investigated the tunneling characteristics through a two-dimensional barrier in a single layer graphene with an energy gap. It is found that when the electron is at a zero angle of incidence, the transmission probability as a function of incidence energy has a gap. Away from the gap the transmission coefficient oscillates with incidence energy which is analogous to that of a conventional semiconductor. The conductance under zero temperature has a gap. The properties of electron transmission may be useful for developing graphene-based nano-electronics.
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Received: 13 May 2010
Revised: 08 October 2010
Accepted manuscript online:
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PACS:
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72.10.Bg
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(General formulation of transport theory)
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73.23.Ad
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(Ballistic transport)
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73.63.Rt
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(Nanoscale contacts)
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Cite this article:
Xu Xu-Guang(徐旭光), Zhang Chao(张潮), Xu Gong-Jie(徐公杰), and Cao Jun-Cheng(曹俊诚) Electron tunneling in single layer graphene with an energy gap 2011 Chin. Phys. B 20 027201
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