The anisotropic energy spectrum dependence of the optical conductivity in bilayer graphene

Publication Type:
Journal Article
Citation:
Optics Communications, 2015, 338 pp. 145 - 148
Issue Date:
2015-03
Full metadata record
Files in This Item:
Filename Description Size
2.pdfPublished Version494.25 kB
Adobe PDF
In this paper, the longitudinal optical conductivity in bilayer graphene was calculated analytically and numerically. In addition to the quadratic terms in the effective-mass approximation Hamiltonian, the linear term, which relates to the indirect interlayer coupling, was included. The nonparabolic energy dispersion was obtained. Two intra- and inter-band transition channels for optical transition via carriers absorbing the optical energy are observed. The inter-band transition offers the main contribution and is almost a constant when the optical energy is larger than two times the Fermi energy. In the presence of the complex energy and pseudospin angle relationship, doing the numerical integration to the wavevector k, the contribution of the intra-band optical transition to the optical conductivity (View the MathML source) is strengthened in the low optical energy region, while the analytical results with parabolic energy curves contribute less to View the MathML source. In addition, the optical conductivity also depends on the electron density (or gate voltage) and the broadening width.
Please use this identifier to cite or link to this item: