We present the Composite Operator Method (COM) as a modern approach to the study of strongly correlated electronic systems, based on the equation of motion and Green’s function method. COM uses propagators of composite operators as building blocks at the basis of approximate calculations and algebra constrains to fix the representation of Green’s functions in order to maintain the algebraic and...

We demonstrate the ability of the phase space formulation of quantum mechanics to provide convenient means and intuitive notions for exploring the process of transition from a quantum to a classical state known as decoherence. The Wigner equation, which is usually relevant for electron transport in nanostructures, augmented by the Boltzmann scattering operator is now applied to the time depende...

The quantum transport computations have been carried on four different width of zigzag graphene using a nonequilibrium Green’s function method combined with density functional theory. The computed properties are included transmittance spectrum, electrical current and quantum conductance at the 0.3V as bias voltage.  The considered systems were composed from one-layer graphene sheets differing w...

the concept of “form of literary work” highly significant in formalism depends on the two following suggestions. 1) any part of literature, from word to speech, must be studied and known on the basis of its relationship with other parts or constitutes. thus, recognition of structural or original foundation of the works of art is the most important function of any given literary research. 2)...

The conductance photoswitching of azobenzene derivatives on Co surface is found in good agreement between experiment (C-AFM/UHV) and theory (NEGF/DFT). These results make this Co–AzBT molecular junction a test-bed for spintronics.

Adsorption of the toxic gas molecules carbon monoxide (CO), dioxide (CO2) and ammonia (NH3 ) on edge N-doped sawtooth penta-graphene nanoribbons (N:SSPGNRs) was studied using first-principles methods. Basing our study density functional theory (DFT), we investigated adsorption configurations, energy, charge transfer, electronic properties CO-, CO2 - NH3- adsorbed ontoN:SSPGNRs. We found that CO...