in the present paper, resonant frequencies and modes of a three-atom photonic molecule and a photonic crystal placed within a cavity are numerically calculated. first, governing formulation in transverse electric field mode (te) is obtained using maxwell equations. then, an algorithm based on a finite difference scheme and matrix algebra is presented. the algorithm is then implemented in a comp...

Relativistic electrons counterpropagating through the center of a radially polarized J_{1} optical Bessel beam in vacuum will emit radiation in a manner analogous to the channeling radiation that occurs when charged particles traverse through a crystal lattice. However, since this interaction occurs in vacuum, problems with scattering of the electrons by the lattice atoms are eliminated. Contra...

The mechanism of proton motion in a LaScO3 perovskite crystal was studied by ab initio molecular dynamics. calculations were performed at different temperatures, locations, and initial velocity the proton. Different magnitudes directions external electric field also considered. It is shown that location interaction between its nearest environment are great importance to character movement, whil...

The inclusion of nanoparticles modifies a number of fundamental properties of many materials. Doping of nanoparticles in self-organized materials such as liquid crystals may be of interest for the reciprocal interaction between the matrix and the nanoparticles. Elongated nanoparticles and nanotubes can be aligned and reoriented by the liquid crystal, inducing noticeable changes in their optical...

2014 We have analysed the slow relaxation Mössbauer emission spectrum obtained at T = 0.11 K of the paramagnetic ion Yb3+ in palladium. In this alloy, the two Yb3+ lowest crystal field states (ground state 03937 and first excited state 03938) are quasi-degenerate (separation 0394 ~ 2.5 K). In this situation the magnetic hyperfine spectrum is very sensitive to crystal field distortions away from...

The phase-field-crystal model is by now widely used in order to predict crystal nucleation and growth. For colloidal solidification with completely overdamped individual particle motion, we show that the phase-field-crystal dynamics can be derived from the microscopic Smoluchowski equation via dynamical density-functional theory. The different underlying approximations are discussed. In particu...

We apply the slave-boson approach of Kotliar and Ruckenstein to the two-band Hubbard model with an Ising like Hund’s rule coupling and bands of different widths. On the mean-field level of this approach we investigate the Mott transition and observe both separate and joint transitions of the two bands depending on the choice of the interand intraorbital Coulomb interaction parameters. The meanf...

We theoretically propose a generation of an antiferro skyrmion crystal (AF-SkX) in synthetic bilayer antiferromagnetic system under external magnetic field. By performing the simulated annealing for spin model on centrosymmetric triangular lattice, we find that interplay among layer-dependent Dzyaloshinskii–Moriya interaction, easy-plane single-ion anisotropy, interlayer exchange and in-plane f...

by analyzing the zero-field-splitting parameters and of cr2+ (3d4) ion located at tetrahedral site in znse crystal, the local structure distortion and absorption spectra around cr2+ in znse: cr2+ system have been calculated on the basis of the complete energy matrix for the d4 configuration within the strong-filed-representation. it is shown that there exists an expansion distortion in the loca...