The two-dimensional ferromagnetic anisotropic Ashkin-Teller model is investigated through a real-space renormalization-group approach. The critical frontier, separating five distinct phases, recover all the known exacts results for the square lattice. The correlation length (ν T) and crossover (φ) critical exponents are also calculated. With the only exception of the four-state Potts critical p...

Identities and inequalities are proved for the derivatives of order parameters and correlation functions of the Ising spin glass along a line in the phase diagram. The results serve as additional evidence that the ferromagnetic phase is composed of two regions, one with strong ferromagnetic ordering and the other with the effects of disorder dominant. The Nishimori line marks a crossover betwee...

Effects of randomness on the spin-1 2 and 1 antiferromagnetic Heisen-berg chains are studied using the quantum Monte Carlo method with the continuous-time loop algorithm. We precisely calculated the uniform susceptibility , string order parameter, spatial and temporal correlation length, and the dynamical exponent, and obtained a phase diagram. The generalization of the continuous-time loop alg...

The transition bridge between zero-dimensional quantum dots and one-dimensional quantum wires is explored theoretically by means of the construction of the addition energy spectra of nanorods with different lengths. Spin density-functional theory supplemented with full configuration interaction calculations are carried out. The addition energy spectra are qualitatively related to the single par...

We study the one-dimensional Kondo lattice model through the density-matrix renormalization group. Our results for the spin-correlation function indicate the presence of a small Fermi surface in large portions of the phase diagram, in contrast to some previous studies that used the same technique. We argue that the discrepancy is due to the open boundary conditions, which introduce strong charg...

We examine the low–temperature magnetic properties of moderately doped La2−xSrxCuO4, paying particular attention to the spin–glass phase and the commensurate–incommensurate transition as they are affected by Sr impurity disorder. A model of the carriers, believed to be appropriate at low temperatures, is employed in the CuO2 planes that accounts for both the strong coupling of the hole’s motion...

We investigate colloidal suspensions under shear flow through numerical experiments. By measuring the time-correlation function of a bond-orientational order parameter, we find a divergent time scale near a transition point from a disordered fluid phase to an ordered fluid phase, where the order is characterized by a nonzero value of the bond-orientational order parameter. We also present a pha...

The QCD phase diagram may feature a critical end point at a temperature T and baryon chemical potential μ which is accessible in heavy ion collisions. The universal long wavelength fluctuations which develop near this Ising critical point result in experimental signatures which can be used to find the critical point. The magnitude of the observed effects depends on how large the correlation len...

Pair-correlation functions and phase separation in a two-component point Yukawa uid. Articles you may be interested in Interfacial and wetting properties of a binary point Yukawa fluid Microphase separation in multigraft copolymer melts studied by random-phase approximation and self-consistent field theory Phase separation of a binary two-dimensional core-softened fluid Solvent-mediated interac...

Molecular-thermodynamic models assisted with experimental measurements are applied to correlate and predict the volume transition and structural ordering of poly(N-isopropylacrylamide) (PNIPAM) microgel particles dispersed in pure water. The effective pair potential between PNIPAM particles is represented by a Sutherland-like potential where the size and energy parameters are correlated with pa...