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20 papers · 1 filter
Phase transitions in nonequilibrium d-dimensional models with q absorbing states
A. Lipowski, M. Droz
A nonequilibrium Potts-like model with absorbing states is studied using Monte Carlo simulations. In two dimensions and the model exhibits a discontinuous transition. For…
Urn model of separation of sand
Adam Lipowski, Michel Droz
We introduce an urn model which describes spatial separation of sand. In this dynamical model, in a certain range of parameters spontaneous symmetry breaking takes place and equipa…
Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
R. Coldea, D. A. Tennant, K. Habicht +3
We propose a method for measuring spin Hamiltonians and apply it to the spin-1/2 Heisenberg antiferromagnet Cs2CuCl4, which shows a 2D fractionalized RVB state at low fields. By ap…
Quantum-optical states in finite-dimensional Hilbert space. II. State generation
Wieslaw Leonski, Adam Miranowicz
In the second part of our review (for the first part see quant-ph/0108080), we discuss a physical model for generation of "truncated" coherent and squeezed states in finite-dimensi…
Dynamics-dependent criticality in models with q absorbing states
A. Lipowski, M. Droz
We study a one-dimensional, nonequilibrium Potts-like model which has symmetric absorbing states. For , as expected, the model belongs to the parity conserving universalit…
Variability of accretion flow in the core of the Seyfert galaxy NGC 4151
B. Czerny, V. T. Doroshenko, M. Nikolajuk +3
We analyze observations of the Seyfert galaxy NGC 4151 covering 90 years in the optical band and 27 years in the 2-10 keV X-ray band. We compute the Normalized Power Spectrum Densi…