2024-03-29T15:11:51Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/286362016-02-16T08:21:17Zcom_10261_89com_10261_3col_10261_342
DIGITAL.CSIC
author
Castro, Eduardo V.
author
Novoselov, K. S.
author
Morozov, S. V.
author
Peres, N. M. R.
author
Lopes dos Santos, J. M. B.
author
Nilsson, Johan
author
Guinea, F.
author
Geim, A. K.
author
Castro Neto, A. H.
2010-10-21T09:57:37Z
2010-10-21T09:57:37Z
2010-05-05
Journal of Physics: Condensed Matter 22(17) : 175503 (2010)
0953-8984
http://hdl.handle.net/10261/28636
10.1088/0953-8984/22/17/175503
1361-648X
We study, within the tight-binding approximation, the electronic properties of a graphene bilayer in the presence of an external electric field applied perpendicular to the system—a biased bilayer. The effect of the perpendicular electric field is included through a parallel plate capacitor model, with screening correction at the Hartree level. The full tight-binding description is compared with its four-band and two-band continuum approximations, and the four-band model is shown to always be a suitable approximation for the conditions realized in experiments. The model is applied to real biased bilayer devices, made out of either SiC or exfoliated graphene, and good agreement with experimental results is found, indicating that the model is capturing the key ingredients, and that a finite gap is effectively being controlled externally. Analysis of experimental results regarding the electrical noise and cyclotron resonance further suggests that the model can be seen as a good starting point for understanding the electronic properties of graphene bilayer. Also, we study the effect of electron–hole asymmetry terms, such as the second-nearest-neighbour hopping energies t' (in-plane) and γ4 (inter-layer), and the on-site energy Δ.
eng
openAccess
Condensed matter
Nanoscale science and low-D systems
Electronic properties of a biased graphene bilayer
artículo
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URL
https://digital.csic.es/bitstream/10261/28636/1/0807.3348v2.pdf
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0807.3348v2.pdf
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0807.3348v2.pdf.txt