[en] The role of nonlinearity, dispersion, and nonuniformity in the evolution of packets of spiral density waves is considered. It is shown that the characteristic times of evolution of a packet determined by these effects can be considerably less than the time of its propagation through the galactic disk and must be taken into account in the interpretation of the observed spiral structure

No abstract available

[en] The Josephson coupling between a conventional and an unconventional superconductor is investigated as a function of the properties of the tunneling barrier. A simple model is adopted for the tunneling probability and it is shown that its variation dramatically affects the I_cR_n product of an s-d, as opposed to an s-s junction. Based on these conclusions, experiments are proposed to probe the symmetry of the order parameter in high-temperature superconductors

[en] We study the collisional decay of a strongly driven Bose-Einstein condensate oscillating between two momentum modes. The resulting products of the decay are found to strongly deviate from the usual s-wave halo. Using a stochastically seeded classical field method we simulate the collisional manifold. These results are also explained by a model of colliding Bloch states

[en] Utilizing phenomenological two-components Ginzburg-Landau equation, we investigate the vortex structures in nano-sized composite structures of d- and s-wave superconductors (d-dot), which shows spontaneous half-quantum magnetic fluxes. Especially, effects of disorders in junctions between d- and s-wave superconductors are investigated. Holes in junction at the corners do not affect the magnetic flux patterns. Although the large hole at the corner changes the position of the flux. A wide disorder along the junction affects the magnetic structures much. At the edges of the non-disordered junction, there appear fractional fluxes.

No abstract available

[en] We compute the local variation of order parameter induced by an impurity for the two-dimensional order parameters of the general non-s-wave gap as well as an anisotropic s-wave gap, while taking into account the Born and unitarity limits of impurity scattering at all temperatures. The anisotropy of the perturbed gap is determined by the symmetry of the underlying order parameters. The perturbation for the anisotropic s-wave gap is much weaker than the non-s-wave gaps

[en] We calculate the average transmission for s- and p-polarized electromagnetic (EM) waves and consequently the localization length of two-dimensional (2D) disordered systems which are periodic on the average; the periodic systems form a square lattice consisting of infinitely long cylinders parallel to each other and embedded in a different dielectric medium. In particular, we study the dependence of the localization length on the frequency, the dielectric function ratio between the scatterer and the background, and the filling ratio of the scatterer. We find that the gaps of the s-polarized waves can sustain a higher amount of disorder than those of the p-polarized waves, due to the fact that the gaps of the s-polarized waves are wider than those of the p-polarized waves. For high frequencies, the gaps of both types of waves easily disappear, the localization length is constant and it can take very small values. The optimum conditions for obtaining localization of EM waves in 2D systems will be discussed. copyright 1996 The American Physical Society

[en] We show that a new state of matter, the d-wave Mott-insulator state (d-Mott state) (introduced recently by [H. Yao, W. F. Tsai, and S. A. Kivelson, Phys. Rev. B 76, 161104 (2007)]), which is characterized by a nonzero expectation value of a local plaquette operator embedded in an insulating state, can be engineered using ultracold atomic fermions in two-dimensional double-well optical lattices. We characterize and analyze the parameter regime where the d-Mott state is stable. We predict the testable signatures of the state in the time-of-flight measurements

[en] We develop and analyze a theoretical model to study p-wave Feshbach resonances of identical fermions in atomic waveguides by extending the two-channel model of Lange et al (2009 Phys. Rev. A 79 013622) and Saeidian et al (2012 Phys. Rev. A 86 062713). The experimentally known parameters of Feshbach resonances in free space are used as input of the model. We calculate the shifts and widths of p-wave magnetic Feshbach resonance of "4"0K atoms emerging in harmonic waveguides as p-wave confinement induced resonance (CIR). Particularly, we show a possibility to control the width and shift of the p-wave CIR by the trap frequency and the applied magnetic field which could be used in corresponding experiments. Our analysis also demonstrates the importance of the inclusion of the effective range in the computational schemes for the description of the p-wave CIRs contrary to the case of s-wave CIRs where the influence of this term is negligible. (paper)