A crystalline solid has as a fundamental property the ordered structure of its atoms. This structure consists of an array of sites forming a regular three-dimensional periodic lattice.
Each sitio of the lattice has a constituent unit that takes only six orientations and is understood as being a...
We use a canonical quantization procedure to set up a quantum Fokker-Planck-Kramers equation that accounts for quantum dissipation in a thermal environment.
However, this characterization hides the irreversible character of the dynamics as well as its influence on the phase transition properties. Entropy production has been revealed to be an important concept for fi...
The chains are mechanically uncoupled but exchange energy randomly through a stochastic noise that affects nearest neighbor particles belonging to distinct chains. We show numerically that the deviati...
La investigación se centra en el pago do 82 millones por euros de modo a la adjudicación de la construcción de lÃneas del metro y do la Ciudad de la Salud
The dissipation term is chosen to ensure that the thermodynamic equilibrium is described by the Gibbs state. An expression for the quantum entropy production is also provided which properly des...
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We have studied an Ising spin system in a transverse field, at zero temperature, under a time oscillating longitudinal field by means of a daniel dantas ator mean-field approximation and a Monte Carlo algorithm, appropriate to study the ground-state properties of quantum spin chains. For large values of the transverse field Γ or large amplitude h0 of the oscillating...
We use a lattice gas model check here to describe the phase transitions in nematic liquid crystals. The phase diagram displays, in addition to the isotropic phase, the two uniaxial nematics, the rod-like and discotic nematics, and the biaxial nematic.
A random variable that depends on a parameter t is called a random function or, if t stands for time, a stochastic variable. We consider here stochastic processes at discrete time and such that the stochastic variable is also discrete. Suppose that a stochastic variable x
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