Vertical absorption edge and universal onset conductance in semi-hydrogenated graphene

Abstract

We show that for graphene with any finite difference in the on-site energy between the two sub-lattices ($\Delta$), The optical absorption edge is determined by the $\Delta$. The universal conductance will be broken and the conductance near the band edge varies with frequency as $1/{\omega }^2$. Moreover, we have identified another universal conductance for such systems without inversion symmetry, i.e., the onset conductance at the band edge is , independent of the size of the band gap. The total integrated optical response is nearly conserved despite of the opening of the band gap.

4 pages, 4 figures

References in corpus (11)

• Electric Field Effect in Atomically Thin Carbon Films
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Substrate-induced band gap opening in epitaxial graphene
• Valley contrasting physics in graphene: magnetic moment and topological transport
• Universal dynamical conductance in graphite
• Strong suppression of weak (anti)localization in graphene
• The optical conductivity of graphene in the visible region of the spectrum
• Unusual Microwave Response of Dirac Quasiparticles in Graphene
• On electron (anti)localization in graphene
• Orientation dependence of the optical spectra in graphene at high frequencies
• Effect of next-nearest neighbor coupling on the optical spectra in bilayer graphene

Cited by in corpus (1)

• Modulation of the thermodynamic, kinetic and magnetic properties of the hydrogen monomer on graphene by charge doping