Universal quantum operation of spin-3/2 Blume-Capel chains

Wetting in Potts and Blume-Capel Models

Wetting may occur when three or more phases (A, B, C,...) coexist. It consists of the appearance of a thick (macroscopic) layer of the C phase at an interface between the A and the B phases. This phenomenon has been observed experimentally and in computer simulation (for a review, see Ref. 1). It has also been investigated by mean field theory ~2 4) and by lowtemperature expansions. (s'6) In th...

Dynamical Blume { Capel Model : Competing Metastable States

The Critical Behaviour of the Spin-3/2 Blume-capel Model in Two Dimensions

The phase diagram of the spin-3/2 Blume-Capel model in two dimensions is explored by conventional finite-size scaling, conformal invariance and Monte Carlo simulations. The model in its τ -continuum Hamiltonian version is also considered and compared with others spin3/2 quantum chains. Our results indicate that differently from the standard spin-1 Blume-Capel model there is no multicritical poi...

Critical Behavior of the Spin-3/2 Blume-Capel Model on a Random Two-Dimensional Lattice

We investigate the critical properties of the spin-3/2 Blume-Capel model in two dimensions on a random lattice with quenched connectivity disorder. The disordered system is simulated by applying the cluster hybrid Monte Carlo update algorithm and re-weighting techniques. We calculate the critical temperature as well as the critical point exponents γ/ν, β/ν, α/ν, and ν. We find that, contrary of...

Spin reduction transition in spin - 32 random Heisenberg chains

Random spin3 2 antiferromagnetic Heisenberg chains are investigated using an asymptotically exact renormalization group. Randomness is found to induce a quantum phase transition between two random-singlet phases. In the strong randomness phase the effective spins at low energies are Se f f5 3 2 , while in the weak randomness phase the effective spins are Se f f5 1 2 . Separating them is a quant...