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Full-Text Articles in Physics
Optically Anisotropic Infinite Cylinder Above An Optically Anisotropic Half Space: Dispersion Interaction Of A Single-Walled Carbon Nanotube With A Substrate, Roger H. French
Faculty Scholarship
A complete form of the van der Waals dispersion interaction between an infinitely long anisotropic semiconducting/insulating thin cylinder and an anisotropic half space is derived for all separations between the cylinder and the half space. The derivation proceeds from the theory of dispersion interactions between two anisotropic infinite half spaces as formulated in Phys. Rev. A 71, 042102 (2005). The approach is valid in the retarded as well as nonretarded regimes of the interaction and is coupled with the recently evaluated ab initio dielectric response functions of various semiconducting/insulating single wall carbon nanotubes, enables the authors to evaluate the strength …
Stacking-Dependent Optical Conductivity Of Bilayer Graphene, Yingying Wang, Zhenhua Ni, Lei Liu, Yanhong Liu, Chunxiao Cong, Ting Yu, Xiao-Jun Wang, Dezhen Shen, Zexiang Shen
Stacking-Dependent Optical Conductivity Of Bilayer Graphene, Yingying Wang, Zhenhua Ni, Lei Liu, Yanhong Liu, Chunxiao Cong, Ting Yu, Xiao-Jun Wang, Dezhen Shen, Zexiang Shen
Department of Physics and Astronomy Faculty Publications
The optical conductivities of graphene layers are strongly dependent on their stacking orders. Our first-principle calculations show that, while the optical conductivities of single-layer graphene (SLG) and bilayer graphene (BLG) with Bernal stacking are almost frequency-independent in the visible region, the optical conductivity of twisted bilayer graphene (TBG) is frequency-dependent, giving rise to additional absorption features due to the band folding effect. Experimentally, we obtain from contrast spectra the optical conductivity profiles of BLG with different stacking geometries. Some TBG samples show additional features in their conductivity spectra, in full agreement with our calculation results, while a few samples give …