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Featured researches published by J. Florencio.


Physical Review E | 2013

Phase transitions in the two-dimensional superantiferromagnetic Ising model with next-nearest-neighbor interactions

A. Saguia; Beatriz Boechat; J. Florencio; O. F. de Alcantara Bonfim

We use Monte Carlo and transfer matrix methods in combination with extrapolation schemes to determine the phase diagram of the two-dimensional superantiferromagnetic (SAF) Ising model with next-nearest-neighbor (NNN) interactions in a magnetic field. The interactions between nearest-neighbor (NN) spins are ferromagnetic along x, and antiferromagnetic along Y. We find that for sufficiently low temperatures and fields, there exists a region limited by a critical line of second-order transitions separating a SAF phase from a magnetically induced paramagnetic phase. We did not find any region with either first-order transition or with reentrant behavior. The NNN couplings produce either an expansion or a contraction of the SAF phase. Expansion occurs when the interactions are antiferromagnetic, and contraction when they are ferromagnetic. There is a critical ratio R(c)=1/2 between NNN and NN couplings, beyond which the SAF phase no longer exists.


Physical Review E | 2017

Quantum fidelity approach to the ground-state properties of the one-dimensional axial next-nearest-neighbor Ising model in a transverse field

O. F. de Alcantara Bonfim; Beatriz Boechat; J. Florencio

In this work we analyze the ground-state properties of the s=1/2 one-dimensional axial next-nearest-neighbor Ising model in a transverse field using the quantum fidelity approach. We numerically determined the fidelity susceptibility as a function of the transverse field B_{x} and the strength of the next-nearest-neighbor interaction J_{2}, for systems of up to 24 spins. We also examine the ground-state vector with respect to the spatial ordering of the spins. The ground-state phase diagram shows ferromagnetic, floating, and 〈2,2〉 phases, and we predict an infinite number of modulated phases in the thermodynamic limit (L→∞). Paramagnetism only occurs for larger magnetic fields. The transition lines separating the modulated phases seem to be of second order, whereas the line between the floating and the 〈2,2〉 phases is possibly of first order.


Journal of the Physical Society of Japan | 2001

Dynamics of the Ising Chain with Four-Spin Interactions in a Disordered Transverse Magnetic Field

Osiel F. De Alcantara Bonfim; Beatriz Boechat; Claudette Cordeiro; Francisco C. Sa Barreto; J. Florencio

We study the time dependent behavior of the four-spin interactions Ising chain in the presence of a disordered transverse magnetic field. In order to analyze the effects of field randomness in the dynamical behavior of the system we calculate the time-dependent correlation function and the longitudinal relaxation function of the infinite chain. We consider a bi-modal distribution for the field energy strength, where one of its values equals the exchange coupling energy while the other value can be lower or higher than the coupling energy. We find that an increasing concentration of weaker fields produces an enhancement of the central mode behavior. However, when the concentration of stronger fields increases, the system undergoes a crossover from central mode to collective-type dynamics.


Physical Review E | 1998

Chaotic dynamics in billiards using Bohm's quantum mechanics

O. F. de Alcantara Bonfim; J. Florencio; F. C. Sá Barreto


Physical Review E | 1998

Quantum chaos in a double square-well: An approach based on Bohm's view of quantum mechanics

O. F. de Alcantara Bonfim; J. Florencio; F. C. Sá Barreto


Physical Review Letters | 2000

Comment on "Inelastic collapse of a randomly forced particle"

J. Florencio; F. C. Sá Barreto; O. F. de Alcantara Bonfim


Physical Review B | 2006

Quantum phase transitions in the transverse one-dimensional Ising model with four-spin interactions

O. F. de Alcantara Bonfim; J. Florencio


Physical Review Letters | 1994

Comment on Long-time dynamics via direct summation of infinite continued fractions''

J. Florencio; O.F. de Alcantara Bonfim


arXiv: Statistical Mechanics | 2018

Ground-state properties of the one-dimensional transverse Ising model in a longitudinal magnetic field

O. F. de Alcantara Bonfim; Beatriz Boechat; J. Florencio


Bulletin of the American Physical Society | 2018

Quantum phase transitions in the transverse Ising model with three-spin interactions

Osiel F. De Alcantara Bonfim; Beatriz Boechat; J. Florencio

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Beatriz Boechat

Federal Fluminense University

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O. F. de Alcantara Bonfim

Federal University of Pernambuco

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A. Saguia

Federal Fluminense University

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F. C. Sá Barreto

Universidade Federal de Minas Gerais

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Claudette Cordeiro

Federal Fluminense University

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J. A. Plascak

Universidade Federal de Minas Gerais

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O. F. de Alcantara Bonfim

Federal University of Pernambuco

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