We study the adiabatic limit in the density matrix approach for a quantum system coupled to a weakly dissipative medium. The energy spectrum of the quantum model is supposed to be non-degenerate. Inâ€¦ (More)

For any d-dimensional selfâ€“interacting fermionic model, all coefficients in the highâ€“temperature expansion of its grand canonical partition function can be put in terms of multivariable Grassmannâ€¦ (More)

We consider the spin 1/2 model coupled to a slowly varying magnetic field in the presence of a weak damping represented by a Lindblad-form operators. We show that Berryâ€™s geometrical phase remainsâ€¦ (More)

We study a two-level model coupled to the electromagnetic vacuum and to an external classic electric field with fixed frequency. The amplitude of the external electric field is supposed to vary veryâ€¦ (More)

We consider an arbitrary translationally invariant chain model, with nearest neighbors interaction and satisfying periodic boundary condition. The approach developed here allows a thermodynamicâ€¦ (More)

BACKGROUND
The lack of accuracy of point of care (POC) glucose monitors has limited their use in the diagnosis of neonatal hypoglycemia. Hematocrit plays an important role in explaining discordantâ€¦ (More)

The purpose of the present work is to apply the method recently developed in reference [1] to the spin-1 Ising chain, showing how to obtain analytical Î²-expansions of thermodynamical functionsâ€¦ (More)

We show that the difference of adiabatic phases, that are basis-dependent, in noncyclic evolution of nondegenerate quantum systems have to be taken into account to give the correct interferenceâ€¦ (More)

We study the adiabatic evolution of a two-level model in the presence of an external classical electric field. The coupling between the quantum model and the classical field is taken in the electricâ€¦ (More)

We exploit the grassmannian nature of the variables involved in the path integral expression of the grand canonical partition function for selfâ€“interacting fermionic models to show, in oneâ€“spaceâ€¦ (More)