Showing papers in "Physics Letters A in 1989"

TL;DR: In this article, the properties of optical resonators with quality-factor Q⩾108, effective volume of e.m. field localization Veff ≥ 10−9 cm3 and threshold power of optical bistability Wbist≈10−5 W are described.

TL;DR: In this article, a two-dimensional (2D) lattice model of hexagonal molecules on a triangular lattice interacting via a nearest-neighbour n -inverse-power site-site potential is shown to display an anomalous (negative) Poisson ratio at high densities when the anisotropy (nonconvexity) of the molecules is substantial.

TL;DR: In this paper, a new algorithm is used to determine fractal dimensions by box counting for dynamic and iterated function systems, which is fast, accurate, and less dependent on data specific curve fitting criteria than the correlation dimension.

TL;DR: In this article, the interaction geometry comprising four travelling laser waves which is used to obtain optical Ramsey fringes in atomic spectroscopy, is also well suited to build an atom interferometer based on the atomic recoil.

TL;DR: In this paper, the authors obtained nonstationary soliton-like solutions for an extended version of the classical massive Thirring model which, in nonlinear optics, describes Bragg-resonant wave propagation in a periodic Kerr medium.

TL;DR: In this article, the long-term free evolution of wave packets formed by highly excited states of quantum systems performing regular periodic motion in the classical limit is considered, and the universal asymptotic scenario of the wave function temporal development is discovered which provides the generation of a certain sequence of initial wave packet fractional revivals.

TL;DR: In this article, the first minimum of the logarithm of the generalized correlation integral C1(τ) provides an easily evaluable criterion for the proper choice of the time delay τ that is needed to reconstruct the trajectory in phase space from chaotic scalar time series data.

TL;DR: In this paper, it was shown that the dynamics of a tunnel junction with small capacitance and conductance biased by a voltage smaller than the Coulomb blockade threshold can be adequately described in terms of the macroscopic quantum tunneling of the electric range ( q -MQT).

TL;DR: In this paper, it was shown that the whole Painleve analysis of PDEs is invariant under an arbitrary homographic transformation of the function defining the singularity manifold.

TL;DR: In this article, an algebraic method to construct an infinite number of exact solutions of the KP hierarchy in terms of the hodograph transform is presented, which can be also applied to any hydrodynamic type equations with additional symmetries.

TL;DR: The existence of bound states for the s-wave Klein-Gordon equation for vector and scalar Hulthen-type potentials is shown in this paper, provided that the potential size is large enough.

TL;DR: In this article, a stochastic model for continuous measurement in a quantum system is given, where the posterior dynamics, including a continuous collapse of the wave function, is described by a nonlinear wave equation.

TL;DR: In this article, the nonlinear Schrodinger (NS) and KdV equations are shown to be reductions of the self-dual Yang-Mills (SDYM) equations.

TL;DR: In this article, a new model of the internal DNA dynamics is proposed and the nonlinear dynamical equations are derived and some particular solutions of the equations are discussed, and a new method for solving the equations is proposed.

TL;DR: In this paper, the phase shift in the interference of a magnetic or electric dipole due to the electromagnetic field is obtained relativistically and non-relativistically, and the force and torque on the particle are obtained in the classical limit.

TL;DR: In this article, the effect of internal reflection of the propagation of waves in strongly scattering media has been investigated, and it has been shown that for backscattering and for transmission through relatively thin slabs, internal reflection can be very strong.

TL;DR: In this paper, a new solid state structure with random atomic arrangement was proposed for nanocrystalline materials, which is shown by means of EXAFS to exhibit a new stable solid state.

TL;DR: In this paper, even and odd coherent states are discussed and the change of these two effects and the amplitude-squared squeezing when the two states are displaced are studied. And the authors showed that the displaced even coherent state can exhibit amplitude-quare squeezing.

TL;DR: In this article, three dominating subsequences of diagrams in the correlation correction to amplitude are summed: screening of the electron-electron interaction, particle-hole interaction, and the iterations of the self-energy.

TL;DR: In this paper, a theoretical analysis confirmed that MFM image interpretation can be performed in terms of point dipole probing provided that some experimental constraints are satisfied, and the validity of the criterion is demonstrated for various experimentally relevant examples.

TL;DR: In this paper, Hall voltages in a resistive superconducting state and in a normal state are shown to have opposite signs, which is explained by a flux vortex motion.

TL;DR: In this article, it is shown that there is substantial bias in dimension calculations with small data sets and that the estimated error bars are a small fraction of the actual error bars, and two empirical equations are presented to model these phenomena.

TL;DR: In this paper, the wavelet transform was applied for characterizing the geometrical complexity of two-dimensional fractal aggregates and demonstrated the structural self-similarity of Witten and Sander diffusion-limited aggregates.

TL;DR: In this paper, it is pointed out that such "solutions" are unsatisfactory as they stand, and must be supplemented by a new empirical interpretation of the formal state description of quantum mechanics.

TL;DR: In this article, a procedure for obtaining ǫ(α) directly from the scaling of histograms of multifractal measures is presented, and applied to several measures arising in dynamical systems and fully developed turbulence.

TL;DR: In this article, it was shown that the superintegrable chiral Potts model which has zero momentum and is the ground state for small λ is not the ground states for λ = 1 by exhibiting a state of nonzero momentum whose eigen value crosses the zero momentum eigenvalue at a value of λ less than 1.

TL;DR: In this article, a stochastic model for the continuous non-demolition observation of the position of a quantum particle in a potential field and a boson reservoir is given, and it is shown that the Gaussian wave packet evolving according to the posterior wave equation with a quadratic potential tends to the Gaussian stationary solution.

TL;DR: In this paper, three different Lax representations for the periodic relativistic Toda lattice are exhibited and the complete integrability of the system is also proven, and the Lax representation is shown to be complete.

TL;DR: In this article, it was shown that for the SU(2) coupled system, the spherically symmetric asymptotically flat solutions possessing a non-singular event horizon and non-zero color magnetic charge are Abelian.

TL;DR: In this paper, the thermal equilibrium number of solitons in DNA as a function of absolute temperature and the number of base pairs was calculated by modeling DNA as Toda lattice with parameters chosen to match experimentally measured properties of DNA.