Graphene/Li-Ion battery

Density function theory calculations were carried out to clarify storage states of Lithium (Li) ions in graphene clusters. The adsorption energy, spin polarization, charge distribution, electronic gap, surface curvature and dipole momentum were calculated for each cluster. Li-ion adsorbed graphene, doped by one Li atom is spin polarized, so there would be different gaps for different spin polarization in electrons. Calculation results demonstrated that a smaller cluster between each two larger clusters is preferable, because it could improve graphene Li-ion batteries; consequently, the most proper graphene anode structure has been proposed.Comment: 19 pages, 7 figures, 1 tabl

Li-doped graphene for spintronic applications

Generating spintronic devices has been a goal for the nano science. Here, Li-doped graphene flakes has been suggested for spintronic applications. To aim this goal, density function theory has been used to determine magnetic phases of monolayer and bilayer doped graphene nanoflakes. Adsorption energies, spin polarizations, electronic gaps, magnetic properties and robustness of spin-polarized states have been studied in the presence of dopants and second layers. Based on these results, graphene flakes have been introduced as single molecular magnets and spin amplifiers for room temperature applications. It has been determined that for bilayer flakes with two layers of different sizes, molecular orbitals switch between the layers around the Fermi level. Based on this switch of molecular orbitals in a bilayer graphene flake, spin on/off switches and spintronic memory devices could be achievable

A Linguistic Analysis of Errors in News Agencies and Websites of Iran

In this research, we analyzed the common errors of three highly visited news websites of Iran within three syntactic, morphological and typographic-orthographic level to scrutinize the pitfalls of news websites. The data was gathered from three news websites of ALEF, ASRE-IRAN AND TABNAK which are listed among the most visited news websites in Iran based on Alexa ranking site. The findings showed that in studying the syntactic level of the materials on the news sites, one can face with a breach in the unmarked constituent order of Persian language and asymmetrical verbs deletion. Furthermore, the writing errors in the news are more of the typographical errors, and lack of using punctuations in the news and the commonest linguistic errors in morphological level in news sites are lexical redundancy

Quantum nonlinear planar Hall effect in bilayer graphene: an orbital effect of a steady in-plane magnetic field

We study the quantum nonlinear planar Hall effect in bilayer graphene under a steady in-plane magnetic field. When time-reversal symmetry is broken by the magnetic field, a charge current occurs in the second-order response to an external electric field, as a result of the Berry curvature dipole in momentum space. We have shown that a nonlinear planar Hall effect originating from the anomalous velocity is deduced by an orbital effect of an in-plane magnetic field on electrons in bilayer graphene in the complete absence of spin-orbit coupling. Taking into account the symmetry analysis, we derived the dominant dependence of Berry curvature dipole moment on the magnetic field components. Moreover, we illustrate how to control and modulate the Berry curvature dipole with an external planar magnetic field, gate voltage, and Fermi energy