Conjugated‐circuit computations on two‐dimensional carbon networks

Optical and magnetic properties of free-standing silicene, germanene and T-graphene system

The physics of two-dimensional (2D) materials is always intriguing in their own right. For all of these elemental 2D materials, a generic characteristic feature is that all the atoms of the materials are exposed on the surface, and thus tuning the structure and physical properties by surface treatments becomes very easy and straightforward. The discovery of graphene have fostered intensive research interest in the field of graphene like 2D materials such as silicene and germanene (hexagonal network of silicon and germanium, respectively). In contrast to the planar graphene lattice, the silicene and germanene honeycomb lattice is slightly buckled and composed of two vertically displaced sublattices.The magnetic properties were studied by introducing mono- and di-vacancy (DV), as well as by doping phosphorus and aluminium into the pristine silicene. It is observed that there is no magnetism in the mono-vacancy system, while there is large significant magnetic moment present for the DV system. The optical anisotropy of four differently shaped silicene nanodisks has revealed that diamond-shaped (DS) silicene nanodisk possesses highest static dielectric constant having no zero-energy states. The study of optical properties in silicene nanosheet network doped by aluminium (Al), phosphorus (P) and aluminium-phosphorus (Al-P) atoms has revealed that unlike graphene, no new electron energy loss spectra (EELS) peak occurs irrespective of doping type for parallel polarization. Tetragonal graphene (T-graphene) having non-equivalent (two kinds) bonds and non-honeycomb structure shows Dirac-like fermions and high Fermi velocity. The higher stability, large dipole moment along with high-intensity Raman active modes are observed in N-doped T-graphene. All these theoretical results may shed light on device fabrication in nano-optoelectronic technology and material characterization techniques in T-graphene, doped silicene, and germanene.

Optical properties and magnetic flux-induced electronic band tuning of a T-graphene sheet and nanoribbon

Tetragonal graphene (T-graphene) is a theoretically proposed dynamically stable, metallic allotrope of graphene.

New carbon allotropes with metallic conducting properties: a first-principles prediction

Combining density functional theory computation and the global minimum structural search, we have found new α-, β-, and δ-phographene carbon allotropes.

Band gap engineering of graphenylene by hydrogenation and halogenation: a density functional theory study

Density functional theory study shows that by controlling the concentration of adsorbate atoms, the band gap of graphenylene could be tuned in a wide range, from 0.075 to 4.98 eV by hydrogenation and 0.024 eV to 4.87 eV by halogenation.

Theoretical two-atom thick semiconducting carbon sheet

A two-atom-thick carbon sheet, called H-net, consists of distorted squares, hexagons, and octagons with three unequal carbon atoms.