Dirac materials have attracted great interest for both fundamental research and electronic devices due to their unique band structures, but the usual near zero bandgap of graphene results in a poor on-off ratio in the corresponding transistors. Here, we report on tinene, monolayer gray tin, as a new two-dimensional material with both Dirac characteristics and a remarkable 72 meV bandgap based o...

By using the tight-binding model and non-equilibrium Green's function method (NEGF), we study band structures transport properties of a silicene nanoribbon with line defect where bulk energy gap is opened due to sublattice symmetry breaking. The flat subband bends downwards or upwards effect defect. spin-orbit coupling induces quantum spin Hall states. Especially, depends on distance between ed...

Physical quantities such as the electronic, mechanical, thermal, and optical properties of Al P codoped silicene forming AlSi6P nanosheets are investigated by first-principle calculations within density functional theory. A particular attention this study is paid to interaction effect between atoms in buckled structure. We infer that type attractive it leads an asymmetry states opening up a ban...

Silicene is a two-dimensional (2D) material with very promising electronic properties for applications in silicon modern technology. However, the first experimental synthesis of silicene on metallic surfaces shows strong interactions between and its substrate, which can alter properties. Here, we report steps growth an insulating surface (NaCl) using scanning tunneling microscopy (STM), low ene...

Using first-principles calculations, we investigate the geometric structures and electronic properties of porous silicene and germanene nanosheets, which are the Si and Ge analogues of α-graphyne (referred to as silicyne and germanyne). It is found that the elemental silicyne and germanyne sheets are energetically unfavourable. However, after the C-substitution, the hybrid graphyne-like sheets ...

Growth through controlled adsorption of ferromagnetic elements such as Fe, Co and Ni on two-dimensional silicene provides an alternative route for silicon-based spintronics. Plane wave DFT calculations show that Fe, Co and Ni adatoms are strongly chemisorbed via strong sigma bonds, with adsorption energies (1.55 - 2.29 eV) that are two to six times greater compared to adsorption on graphene. Al...

Generation of large currents, versatile functionality, and simple structures are of fundamental importance in the development of adiabatic quantum pump devices with nanoscale dimensions. In the present study, we propose an adiabatic quantum pump with a simple structure based on molybdenum disulfide, MoS2, to generate large spin and valley resolved currents. We show that pure and fully polarized...