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Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

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Chinese Physics B 2016年第7期25卷 316-323页

作者： E Lotfi h rezania B Arghavaninia M Yarmohammadi Department of Physics Sanandaj Branch Islamic Azad University Department of Physics Razi University Department of Physics Kermanshah Branch Islamic Azad University Young researchers and Elite Club Kermanshah Branch Islamic Azad University

We address the electrical conductivity of bilayer graphene as a function of temperature, impurity concentration, and scattering strength in the presence of a finite bias voltage at finite doping, beginning with a description of the tight-binding model using the linear response theory and Green＇s function approach. Our results show a linear behavior at high doping for the case of high bias voltage. The effects of electron doping on the electrical conductivity have been studied via changing the electronic chemical potential. We also discuss and analyze how the bias voltage affects the temperature behavior of the electrical conductivity. Finally, we study the behavior of the electrical conductivity as a function of the impurity concentration and scattering strength for different bias voltages and chemical potentials respectively. The electrical conductivity is found to be monotonically decreasing with impurity scattering strength due to the increased scattering among electrons at higher impurity scattering strength.

关键词： bilayer graphene Green's function electrical conductivity

Electronic Correlation Effects on the Optical Properties of SiC,BeO and Boron Nitride Nanotubes and Monolayers

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Communications in Theoretical Physics 2015年第11期64卷 583-589页

作者： h.rezania Z.Aghaii Manesh Department of Physics Razi University

We present numerical calculation of the impact of electron-electron interaction on the behavior of density of states and optical properties of BeO,SiC and Boron-Nitride nanotubes and *** model hamiltonian is applied to describe the dynamics of electrons on the lattice structure of theses *** excitation spectrum of the system in the presence of local electronic interactions has been found using mean Seld *** find the band gap width in both optical absorption and density of states reduces with local hubbard electronic interaction *** absorption spectra exhibits the remarkable peaks,mainly owing to the divergence behavior of density of states and excitonic *** we compare optical absorption frequency behavior of BeO,SiC and Boron-Nitride nanotubes with each *** we investigate the optical properties of BeO and SiC sheets.A novel feature of optical conductivity of these structures is the decrease of frequency gap in the optical spectrum due to electronic interaction.

关键词： nanotube optical conductivity hubbard model

Consideration of transient heat conduction in a semi-infinite medium using homotopy analysis method

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Applied Mathematics and Mechanics(English Edition) 2008年第12期29卷 1625-1632页

作者： A. rezania A. Ghorbali G. Domairry h. Bararnia Department of Mechanical Engineering Babol Industrial University

In the current work, transient heat conduction in a semi-infinite medium is considered for its many applications in various heat fields. here, the homotopy analysis method （hAM） is applied to solve this problem and analytical results are compared with those of the exact and integral methods results. The results show that the hAM can give much better approximations than the other approximate methods： Changes in heat fluxes and profiles of temperature are obtained at different times and positions for copper, iron and aluminum.

关键词： homotopy analysis method semi-infinite medium conduction transient heat transfer integral methods temperature profile

The effect of lithium chloride on morphine-induced tolerance and dependence in isolated guinea pig ileum.

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The effect of lithium chloride on morphine-induced tolerance...