We investigate the influence of diagonal and off-diagonal disorder potentials on superconductivity in an attractive Hubbard model. The study is motivated by recent experimental and theoretical interest in understanding the microscopic mechanism by which impurities destroy superconductivity. In...

The BCS to BEC crossover in attractive Fermi systems is a prototype of weak to strong coupling evolution in many body physics. While extensive numerical results are available, and several approximate methods have been developed, most of these schemes are unsuccessful in the presence of spatial...

We investigate the properties of a graphene system taking into account both the on-site Coulomb repulsion and the Rashba spin-orbit coupling caused by a transverse electric field by using a mean-field approximation of the Hubbard model. It is found that by increasing the strength of the Rashba...

We study a model of an electron on a cylindrical surface, which is coupled to the torsion field due to a dislocation along the axis of the cylinder. We discuss the effect of this torsion field on the energy spectrum of the electrons and analytically calculate persistent currents in the presence...

This work mainly examines the anisotropic transport phenomenon in the presence of square arrays of the mesoscopic pinning sites in superconducting samples. Our results were obtained from a series of numerical simulations as functions of the magnetic field and the pinning radius. Dynamic...

We report numerical investigation of the glassy behavior of random-field exchange models in three dimensions. Correlation of energy with the magnetization for different numbers of spin components has been studied. There is a profound difference between the models with two and three spin...

The striped antiferromagnetic phase of iron-arsenides is investigated by the density functional calculations including Coulomb repulsion. Two low moment solutions with m ≈ 0.4 μ <Subscript> B </Subscript> and m ≈ 1.0 μ <Subscript> B </Subscript> have been found from calculations. The electronic structures indicate that the low moment...</subscript></subscript>

We investigate the electronic structures and magnetic properties of the ferrimagnetic double-perovskites Sr<Subscript>2</Subscript>XReO<Subscript>6</Subscript> (X=Cr, Mn, Fe, Ni) by using Tran and Blaha’s modified Becke and Johnson exchange potential. The calculated results show that Sr<Subscript>2</Subscript>XReO<Subscript>6</Subscript> (X=Cr, Fe) are half-metals, and Sr<Subscript>2</Subscript>XReO<Subscript>6</Subscript>...</subscript></subscript></subscript></subscript></subscript></subscript>

A general technique of exact calculation of any correlation functions for the special class of one-dimensional spin models containing small clusters of quantum spins assembled to a chain by alternating with the single Ising spins is proposed. The technique is a natural generalization of that in...

Under external transverse electronic fields, the structure and electronic properties of the silicene nanoribbon with armchair edge (ASiNR) are studied. We find that the electric properties are modified by a transverse electric field. As affected by a transverse electric field, the band gap...