Electronic properties of a biased graphene bilayer

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Eduardo V Castro (Autor) Outra; Novoselov, KS (Autor) Outra; Morozov, SV (Autor) Outra; Peres, NMR (Autor) Outra; Lopes dos Santos, JMBL (Autor) FCUP; Johan Nilsson (Autor) Outra; Guinea, F (Autor) Outra; Geim, AK (Autor) Outra; Castro Neto, AH (Autor) Outra

Revista

Título: Journal of Physics Condensed Matter

Vol. 22

Página Final: 175503

ISSN: 0953-8984

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 153 Citações

Scopus - 193 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-003-6SE

DOI: 10.1088/0953-8984/22/17/175503

Abstract (EN): 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 gamma(4) (inter-layer), and the on-site energy Delta.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14