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35 papers · 1 filter
Field-induced Ordering in Critical Antiferromagnets
S. L. A. de Queiroz, Thereza Paiva, Jorge S. de Sá Martins +1
Transfer-matrix scaling methods have been used to study critical properties of field-induced phase transitions of two distinct two-dimensional antiferromagnets with discrete-symmet…
Tsallis statistics with normalized q-expectation values is thermodynamically stable: illustrations
A. R. Lima, T. J. P. Penna
We present a study of both the ``Iterative Procedure'' and the `` transformation'', proposed by Tsallis et al (Physica A261, 534) to find the probabilities of a syst…
On the propagation speed of evanescent modes
A. Pablo, L. Barbero, Hugo E. Hernandez F. +1
The group-velocity of evanescent waves (in undersized waveguides, for instance) was theoretically predicted, and has been experimentally verified, to be Superluminal (v_g > c). By…
Non-Linear Effects in Resonant Tunneling; Bistabilities and Self-Sustained Oscillating Currents
E. S. Rodrigues, E. V. Anda, P. Orellana +1
We study non-linear phenomena in double barrier heterostructures. Systems in 3D under the effect of an external magnetic field along the current and 1D systems are analyzed. Non-li…
Time reversal symmetry breaking superconductivity
Haranath Ghosh
We study time reversal symmetry breaking superconductivity with ( or ) symmetries. It is shown that the behavior of such supercond…
Lattice Simulation of Nuclear Multifragmentation
J. S. Sa' Martins, P. M. C. de Oliveira
Motivated by the decade-long debate over the issue of criticality supposedly observed in nuclear multifragmentation, we propose a dynamical lattice model to simulate the phenomenon…