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The one-parametric Wang-Landau (WL) method is implemented together with an extrapolation scheme to yield approximations of the two-dimensional (exchange-energy, field-energy) density of states (DOS) of the 3D bimodal random-field Ising model (RFIM). The present approach generalizes our earlier WL implementations, by handling the final stage of the WL… (More)

- A Malakis, A Nihat Berker, I A Hadjiagapiou, N G Fytas
- Physical review. E, Statistical, nonlinear, and…
- 2009

We study the pure and random-bond versions of the square lattice ferromagnetic Blume-Capel model, in both the first-order and second-order phase transition regimes of the pure model. Phase transition temperatures, thermal and magnetic critical exponents are determined for lattice sizes in the range L=20-100 via a sophisticated two-stage numerical strategy… (More)

- Panagiotis E Theodorakis, Nikolaos G Fytas
- The Journal of chemical physics
- 2012

We use a standard bead-spring model and molecular dynamics simulations to study the static properties of symmetric linear multiblock copolymer chains and their blocks under poor solvent conditions in a dilute solution from the regime close to theta conditions, where the chains adopt a coil-like formation, to the poorer solvent regime where the chains… (More)

- Anastasios Malakis, Nikolaos G Fytas, Gül Gülpinar
- Physical review. E, Statistical, nonlinear, and…
- 2014

We investigate the dependence of the critical Binder cumulant of the magnetization and the largest Fortuin-Kasteleyn cluster on the boundary conditions and aspect ratio of the underlying square Ising lattices. By means of the Swendsen-Wang algorithm, we generate numerical data for large system sizes and we perform a detailed finite-size scaling analysis for… (More)

We investigate the critical behavior of the three-dimensional random-field Ising model (RFIM) with a Gaussian field distribution at zero temperature. By implementing a computational approach that maps the ground-state of the RFIM to the maximum-flow optimization problem of a network, we simulate large ensembles of disorder realizations of the model for a… (More)

- Nikolaos G Fytas, Panagiotis E Theodorakis
- Journal of physics. Condensed matter : an…
- 2013

Conformations of a single-component bottle-brush polymer with a fully flexible backbone under poor solvent conditions are studied by molecular dynamics simulations, using a coarse-grained bead-spring model with side chains of up to N = 40 effective monomers. By variation of the solvent quality and the grafting density σ with which side chains are grafted… (More)

We investigate the critical properties of the d = 3 random-field Ising model with a Gaussian field distribution at zero temperature. By implementing suitable graph-theoretical algorithms, we perform a large-scale numerical simulation of the model for a vast range of values of the disorder strength h and system sizes V = L × L × L, with L 156. Using the… (More)

We investigate the critical properties of the d = 3 random-field Ising model with an equal-weight trimodal distribution at zero temperature. By implementing suitable graph-theoretical algorithms, we compute large ensembles of ground states for several values of the disorder strength h and system sizes up to N = 128 3. Using a new approach based on the… (More)

- Panagiotis E Theodorakis, Nikolaos G Fytas
- Physical review. E, Statistical, nonlinear, and…
- 2012

The effects of bond randomness on the universality aspects of a two-dimensional (d = 2) Blume-Capel model embedded in the triangular lattice are discussed. The system is studied numerically in both its first- and second-order phase-transition regimes by a comprehensive finite-size scaling analysis for a particularly suitable value of the disorder strength.… (More)

Zero – temperature simulations of the 3 d = random–field Ising model (RFIM) with a bimodal distribution suggest that the specific heat's critical behaviour is consistent with an exponent 0 α ≃. Τhis is compatible with experimental measurements on random – field and diluted – antiferromagnetic systems and, together with previous simulations on the Gaussian… (More)