Now showing items 1-20 of 22

    • Bistability in an Ising model with non-Hamiltonian dynamics 

      Heringa, J. R.; Shinkai, H.; Blote, H. W. J.; Hoogland, A.; Zia, R. K. P. (American Physical Society, 1992-03)
      We investigate the phenomenon of magnetization bistability in a two-dimensional Ising model with a non-Hamiltonian Glauber dynamics by means of Monte Carlo simulations. This effect has previously been observed in the Toom ...
    • Bound states of hydrogen atom in a theory with minimal length uncertainty relations 

      Slawny, J. (AIP Publishing, 2007-05)
      The following properties of bound states of hydrogen atom in a theory with noncommuting position operators are investigated: their number, multiplicities, accidental degeneracy, localization, and dependence on the values ...
    • Coarsening of "clouds" and dynamic scaling in a far-from-equilibrium model system 

      Adams, D. A.; Schmittmann, B.; Zia, R. K. P. (American Physical Society, 2007-04)
      A two-dimensional lattice gas of two species, driven in opposite directions by an external force, undergoes a jamming transition if the filling fraction is sufficiently high. Using Monte Carlo simulations, we investigate ...
    • Driven diffusive systems: How steady states depend on dynamics 

      Kwak, W.; Landau, D. P.; Schmittmann, B. (American Physical Society, 2004-06)
      In contrast to equilibrium systems, nonequilibrium steady states depend explicitly on the underlying dynamics. Using Monte Carlo simulations with Metropolis, Glauber, and heat bath rates, we illustrate this expectation for ...
    • Effects of gravity on equilibrium crystal shapes: Droplets hung on a wall 

      Zia, R. K. P.; Gittis, A. (American Physical Society, 1987-04)
      General properties of equilibrium crystal shapes pinned on a vertical wall and subject to gravity are sought. For two-dimensional crystals, or three-dimensional ones with axial symmetry held in suitable geometries, we are ...
    • Effects of receptor clustering on ligand dissociation kinetics: Theory and simulations 

      Gopalakrishnan, Mahima; Forsten-Williams, K.; Nugent, M. A.; Tauber, U. C. (CELL PRESS, 2005-12-01)
      Receptor-ligand binding is a critical first step in signal transduction and the duration of the interaction can impact signal generation. In mammalian cells, clustering of receptors may be facilitated by heterogeneous zones ...
    • equilibrium budding and vesiculation in the curvature model of fluid lipid vesicles 

      Miao, L.; Fourcade, B.; Rao, M. D.; Wortis, M.; Zia, R. K. P. (American Physical Society, 1991-06)
      According to a model introduced by Helfrich [Z. Naturforsch. 28c, 693 (1973)], the shape of a closed lipid vesicle is determined by minimization of the total bending energy at fixed surface area and enclosed volume. We ...
    • Estimate Of The Incoherent-Scattering Contribution To Lidar Backscatter From Clouds 

      de Wolf, D. A.; Russchenberg, H. W. J.; Lighthart, L. P. (Optical Society of America, 1999-09-01)
      Lidar backscatter from clouds in the Delft University of Technology experiment is complicated by the fact that the transmitter has a narrow beam width, whereas the receiver has a much wider one. The issue here is whether ...
    • Exact dynamics of a reaction-diffusion model with spatially alternating rates 

      Mobilia, M.; Schmittmann, B.; Zia, R. K. P. (American Physical Society, 2005-05)
      We present the exact solution for the full dynamics of a nonequilibrium spin chain and its dual reaction-diffusion model, for arbitrary initial conditions. The spin chain is driven out of equilibrium by coupling alternating ...
    • Field-induced vacancy localization in a driven lattice gas: Scaling of steady states 

      Thies, M.; Schmittmann, B. (American Physical Society, 2000-01)
      With the help of Monte Carlo simulations and a mean-field theory, we investigate the ordered steady-state structures resulting from the motion of a single vacancy on a periodic lattice which is filled with two species of ...
    • finger formation in a driven diffusive system 

      Boal, D. H.; Schmittmann, B.; Zia, R. K. P. (American Physical Society, 1991-05)
      A driven diffusive lattice gas is studied in a rectangular geometry: particles are fed in at one side and extracted at the other, after being swept through the system by a uniform driving field. Being periodic in the ...
    • Inhomogeneous exclusion processes with extended objects: The effect of defect locations 

      Dong, J. J.; Schmittmann, B.; Zia, R. K. P. (American Physical Society, 2007-11)
      We study the effects of local inhomogeneities, i.e., slow sites of hopping rate q < 1, in a totally asymmetric simple exclusion process for particles of size l >= 1 (in units of the lattice spacing). We compare the simulation ...
    • New phase in the one-dimensional t-J model 

      Chen, Y. C.; Lee, T. K. (American Physical Society, 1993-05)
      A new phase of a gas of pairs of electrons bounded in a singlet state is found in the one-dimensional t -J model for J > 2t and the density of electrons less than 0.2. This phase was conjectured in the study of the ...
    • Position and length operators in a theory with minimal length 

      Slawny, J. (AIP Publishing, 2007-05)
      Relations between the notions of fundamental and minimal lengths, and duality, in a system with minimal length uncertainty relations are examined. Self-adjoint versions of operators relevant to the problem, and their ...
    • Roughness, spatial, and temporal correlations of an interface in a driven nonequilibrium lattice gas 

      Leung, K. T.; Mon, K. K.; Valles, J. L.; Zia, R. K. P. (American Physical Society, 1989-05)
      The interface of a stochastic Ising lattice gas driven into a nonequilibrium steady state by a constant, uniform electric field E parallel to the interface is studied by extensive Monte Carlo simulation in two dimensions. ...
    • Spin-charge separation in the two-dimensional Hubbard and t-J models at low electronic density 

      Chen, Y. C.; Moreo, A.; Ortolani, F.; Dagotto, E.; Lee, T. K. (American Physical Society, 1994-07)
      The spin- and density-correlation functions of the two-dimensional Hubbard model at low electronic density [n] are calculated in the ground state by using the power method, and at finite temperatures by using the quantum ...
    • Stationary correlations for a far-from-equilibrium spin chain 

      Schmittmann, B.; Schmuser, F. (American Physical Society, 2002-10)
      A kinetic one-dimensional Ising model on a ring evolves according to a generalization of Glauber rates, such that spins at even (odd) lattice sites experience a temperature T(e) (T(o)). Detailed balance is violated so that ...
    • Steady states of a nonequilibrium lattice gas 

      Lyman, E.; Schmittmann, B. (American Physical Society, 2005-09)
      We present a Monte Carlo study of a lattice gas driven out of equilibrium by a local hopping bias. Sites can be empty or occupied by one of two types of particles, which are distinguished by their response to the hopping ...
    • Strongly anisotropic roughness in surfaces driven by an oblique particle flux 

      Schmittmann, B.; Pruessner, G.; Janssen, H. K. (American Physical Society, 2006-05)
      Using field theoretic renormalization, an MBE-type growth process with an obliquely incident influx of atoms is examined. The projection of the beam on the substrate plane selects a "parallel" direction, with rotational ...
    • t-J model studied by the power Lanczos method 

      Chen, Y. C.; Lee, T. K. (American Physical Society, 1995-03)
      The initial trial wave function used in a simple ground-state projection method, the power method, is systematically improved by using Lanczos algorithm. Much faster convergence to the ground state achieved by using these ...