O Grupo de Física Teórica e Computacional (GFTC) do Departamento de Física da Universidade Federal de Alagoas (DF-UFAL) foi criado em 1995 reunindo pesquisadores cujo interesse comum é a aplicação de métodos teóricos e computacionais ao estudo das propriedades físicas da matéria condensada.
Atualmente, o grupo conta com seis doutores bastante ativos na graduação e pós-graduação. O grupo apresenta um sólido espírito de corpo evidenciado pela ativa colaboração entre seus membros e mantido por reuniões semanais nas quais seminários são proferidos por professores, visitantes e estudantes.
O GFTC vem produzindo trabalhos de pesquisa de alta qualidade publicados em revistas especializadas e anais de conferências internacionais. Os recursos computacionais são providos pelo DF-UFAL que vem constantemente atualizando sua capacidade computacional. O laboratório de computação científica do DF/UFAL conta atualmente com uma rede de dez estações de trabalho (533 e 600 MHz), rede de micros (350 MHz) e periféricos. A recente recomendação pela CAPES do programa de Doutorado vem consolidar a capacidade do GFTC da UFAL para o desenvolvimento de pesquisa e formação de pessoal especializado em Física da Matéria Condensada.
Propagação de Danos em sistemas magnéticos. Fenômenos críticos dinâmicos e efeitos de superfície.
Transições de fase em sistemas de elétron itinerantes. Transição metal-isolante em sistemas eletrônicos desordenados e cadeias lineares.
Propriedades estruturais de sólidos.
Criticalidade auto-organizável em processos limitados por difusão. Reações em meios desordenados e modelos de evolução.
Transições de fase e fenômenos críticos. Sistemas magnéticos desordenados e com interações competitivas. Interações de longo alcance em sistemas fortemente correlacionados.
Análise, simulação e modelagem de sistemas complexos. Fenômenos biofísicos, sócio-econômicos e fisiológicos.
2 MicroWay Alpha 600 MHz
8 MicroWay Alpha 533 MHz
2 Sun Sparc Station 4
1 Sun Sparc Station 2
1 Impressora HP Laser Jet 8000DN
1 Servidor Micron Netframe, dual Pentium II 300 MHz
2 Micron Client Pro CS, Pentium II 350 MHz
1 Impressora HP Ink Jet 2000C
|
Crisogono Rodrigues da Silva |
| DSc - CBPF – 1997 | |
|
Heber Ribeiro da Cruz |
| DPhil - University of Oxford – 1985 | |
|
Iram Marcelo Gleria |
| DSc -UnB | |
|
Jenner Barretto Bastos Filho |
| DSc - ETH - 1982 | |
|
José Carlos Cressoni |
| PhD - Imperial College – 1989 | |
|
Madras Viswanathan Gandhi Mohan |
| PhD – Boston University – 1997 | |
|
Marcelo Leite Lyra |
| DSc - UFPE – 1990 | |
|
Roberto Jorge Vasconcelos dos Santos |
| DSc - UFPE - 1986 |
|
1995 |
|
|
Carlos Argolo Pereira Alves |
| “Modelo de Ising Decorado com Spins Clássicos M-Vetoriais, Submetido a um Campo de Anisotropia de Íon Simples Longitudinal ou Perpendicular”, Tese de Mestrado. | |
|
1996 |
|
|
Ayrton Vasconcelos Lima |
| “Propagação de Danos em Filmes Finos Ferromagnéticos de Ising”, Tese de Mestrado. | |
|
1997 |
|
|
Elton Casado Fireman |
| “Modelo BEG Efetivo - Uma Aplicação a Cadeias Lineares Alternadas”, Tese de Mestrado. | |
|
1999 |
|
|
Francisco Anacleto Barros Fidelis de Moura |
| “Transição metal-isolante em cadeias com desordem correlacionada”, Tese de Mestrado. | |
1992
1. “Spontaneous Magnetization of the Extended Discret N-vector Ferromagnetic”
U.M.S. Costa, H.R. da Cruz and C. Tsallis
Physics A 181, 406 (1992)
2. “Hole-hole Correlations Induced by Magnetic Frustration”
M.L. Lyra and S.B. Cavalcanti
J. Magn. Magn. Mat. 104-107, 587 (1992)
3. “Magnetically induced hole-hole correlations in Cu02 Sheets”
M.L. Lyra and S.B. Cavalcanti
Phys. Rev. B 45, 8021 (1992)
4. “Magnetically Driven pair Potential in Cu0-2 Sheets”
M.L. Lyra, C.R. da Silva and S.B. Cavalcanti
Phys. Lett. A 162, 497 (1992)
5. “Temperature-dependent
frustration : a thermo-dynamic rather than a topological effect”
R.J.V. dos Santos and M.L. Lyra
Physica A 182, 133 (1992)
6. “Dynamical aspects of the ferromagnetic transition in the Hubbard model”
M.L. Lyra and M.D. Coutinho-Filho
Solid State Communications, 81, 883 (1992)
7. “Absence of Phase separation in the frustration induced pairing mechanism”
M.L. Lyra and S.B. Cavalcanti
Phys. Rev. B 46, 6607 (1992)
8. “Scaling function near a fluctuation induced tricritical point”
M.L. Lyra and M.D. Coutinho-Filho
Phys. Lett. A 165, 96 (1992)
9. “Phase diagrams of magnetically desordered bilayers”
M.L. Lyra and C.R. da Silva
Phys. Rev. B 46, 3420 (1992)
10.
“Phase Diagram of a Quenched Decorated Ising G Model with Competing
Interactions”
I.P. Fittipaldi, J.R. de Souza and R.J.V. dos Santos
Journal of Magnetism and Magnetic Materials 104, 279
(1992)
1993
11. “Intralayer Correlation Enhancement and Interlayer Coherence Loss in Cu02
Bilayers”
M.L. Lyra and C.R. da Silva
Phys. Rev. B 47, 526 (1993)
12. “Effects of Surface Enhancement of Fluctuation-induced Interactions”
M.L. Lyra, M. Kardar and N.F. Svaiter
Phys. Rev. E 47, 3456 (1993)
13.
“Hubbard model : Field theory and critical Phenomena”
M.L. Lyra, M.D. Coutinho-Filho and A.M. Nemirovsky
Phys. Rev. B 48, 3755 (1993)
14.
“Absence of a Percolation Threshold in a Quantum Diluted Ising Model”
M.L. Lyra
Phys. Rev. B 48, 10272 (1993)
15.
“Universal Surface Scaling behavior
of Hexatic Films”
M.L. Lyra
Phys. Rev. B 47, 2501 (1993)
16.
“Ising Model Decorated with General Spin
Angular Momentum”
S.G.C. Coutinho, F.C. Sá Barreto and R.J.V. dos Santos
Physica AE Physique-Supplement 196, 461 (1993)
1994
17.
“Magnetic Properties in the Ising Mixed Spin-1/2 Spin-1 Superlattice”
E.F. Sarmento, J.C. Cressoni and R.J.V. dos Santos
J. Appl. Phys. 75, 5820 (1994)
18.
“Phase Diagrams of Diluted Ferromagnetic Ising Films in a Transverse Field”
J.C. Cressoni, J.W. Tucker and E.F. Sarmento
J. Appl. Phys. 75, 5841 (1994)
19.
“Radiative properties of a two-level system in the presence of mirrors”
L.H. Ford, N.F. Svaiter and M.L. Lyra
Phys. Rev. A 49, 1378 (1994)
20.
“Evolution of coherent states in a dispersionless fibre with saturable
nonlinearity and the generation of macroscopic quantum-superposition states”
M.L. Lyra and A.S. Gouveia-Neto
J. Mod. Opt. 41, 1361 (1994)
21.
“Saturation effects on modulational instability in non-Kerr like monomode
optical fibers”
M.L. Lyra and A.S. Gouveia-Neto
Opt. Comm. 108, 117 (1994)
22. “Ising Model with Mixed Spins”
V.M. Correia and R.J.V. dos Santos
Journal of Applied Physics, 75, 5838 (1994)
1995
23.
“Ferromagnetic Ising films with surface dilution in a transverse film”
J.M. Tucker, E.F. Sarmento and J.C. Cressoni
J. Mag. Mag. Mat. 147, 24 (1995)
24.
“Antiferromagnetic Ising Model Decorated with D-Vector Spins:Transversal and
Longitudinal Fields Effects”
R.J.V. dos Santos and S.G. Coutinho
International Journal of Modern Physics B 9, 26, 3387 (1995)
25.
“Generalization in a Diluted Neural Network”
C.R. da Silva, F.A. Tamarit, J.J. Arenson, N. Lemke and E.M.F. Curado
J. Phys. A : Math. Gen. 28, 1593 (1995)
1996
26.
“Multifractal entanglement of copropagating electromagnetic fields”
M.L. Lyra
Europhys. Lett. 46, 117 (1996)
27.
“Scaling behavior of the localization length in random dimer harmonic chains
with thermal correlations”
J.C. Cressoni and M.L. Lyra
Phys. Rev. B 53, 5067 (1996)
28.
“Anomalous fluctuations in the dynamics of complex systems : from DNA and
physiology to econophysics”,
G.M. Viswanathan, H.E. Stanley, V. Afanasyev, L.A.N.
Amaral and S.V. Buldyrev
Physica A 224, 302 (1996).
29.
“Lévy Flight Search Patterns of Wandering Albatrosses”
G.M. Viswanathan, V. Afanasyev, S.V. Buldyrev, E.J.
Murphy, P.A. Prince and H.E. Stanley
Nature 381, 413. (1996)
30.
“Scaling and Universality in Animate and Inanimate Systems”
H.E. Stanley, L.A.N. Amaral, S.V. Buldyrev, A.L.
Goldberger, S. Havlin, H. Leschhom, P. Maass, H. Makse, C.-K. Peng, M.A.
Salinger, M.H.R. Stanley, G.M. Viswanathan
Physica A 213, 20 (1996)
31.
“Scaling and universality in living systems”
H.E. Stanley, L.A.N. Amaral, S.V. Buldyrev, A.L.
Goldberger, S. Havlin, H. Leschhorn, P. Maass, C.-K. Peng, M.A. Salinger, M.H.R.
Stanley and G.M. Viswanathan
Fractals 4, 427 (1996)
32.
“Localization length scaling in binary harmonic chains with correlations
controlled by thermal annealing”
J.C. Cressoni and M.L. Lyra
J. Phys. Condens. Matter 8, L83 (1996)
33.
“Universal Multifractal singularity spectrum of generalized purity measures”
M.L. Lyra
Fractals 4, 49 (1996)
34.
“Modulation instability of ultrashort pulses via a generalized nonlinear Schrödinger
equation with deviating argument”
S.B. Cavalcanti and M.L. Lyra
Phys. Lett. A 211, 276 (1996)
35.
“Phase distribution and superstructures on the phase correlations of
copropagating electromagnetic fields”
F.A.B.F. de Moura and M.L. Lyra
J.Mod. Opt. 43, 1671 (1996)
36.
“Scaling behavior of diffusion limited anhilation reactions on random media”
E.L. de Albuquerque and M.L. Lyra
J. Chem. Phys. 105, 5945 (1996)
37.
“Influence of refractory periods in the Hopfield model”
C.R. da Silva, F.A. Tamarit and E.M. Curado
Int. J. Mod. Phys. C 7, 43 (1996)
1997
38.
“Damage-spreading and temporal evolution near the surface-bulk transition in
layered ferromagnetic films”
A.V. Lima, M.L. Lyra and U.M.S. Costa
J. Mag. Mag. Mat. 171, 329 (1997)
39.
“Spreading of Damage in Ferromagnetic Ising Films: Profiles and Temporal Evolution”
A.V. Lima, M.L. Lyra and U.M.S. Costa
J. Appl. Phys. 81, 3983 (1997)
40.
“Diluted Neural Network with Refractory Periods”
C.R. da Silva, F.A. Tamarit and E.M.F. Curado
Phys. Rev. E, 55, 3320 (1997)
41.
“Spreading of damage in the “Quantum S=1/2 Heisenberg Ferromagnet”
I.V. Rojdestvenski, M.L. Lyra and U.M.S. Costa
Phys. Rev. B 56, 2698 (1997)
42.
“Power-law sensitivity to initial conditions within a logisticlike family of
maps : Fractality and nonextensivity”
U.M.S. Costa, M.L. Lyra, A.R. Plastino and C.Tsallis
Phys. Rev. E 56, 2698 (1997)
43.
“Thermodynamics of Alternate Ising Chain of Spins 1 and 3/2 with Dipolar,
Biquadratic and Single ion Interactions”
E.C. Fireman and R.J.V. dos Santos
Journal of Applied Physics, 81, 4198 (1997)
44.
“Generalization of Shannon’s Theorem for Tsallis Entropy”
R.J.V. dos Santos
Journal of Mathematical Physics, 38, 8, 4104(1997)
45.
“Scaling Properties of DNA Sequences and Heartbeat Rate”
S. Havlin, S.V. Buldyrev, A.L. Goldberger, P. Ch.
Ivanov, C.-K. Peng, H.E. Stanley and G.M. Viswanathan
Proceedings of the International School of Physics
“Enrico Fermi”, Course CXXXIV, edited by F. Mallamace and H.E. Stanley (IOS
Press, Amsterdam, pp. 445 (1997)
46.
“Deviations from Uniform Power Law Scaling in Nonstationary Time Series”
G.M. Viswanathan, C.-K. Peng, H.E. Stanley and A.L. Goldberger
Physical Review E 55, 845 (1997)
47.
“Quantification of DNA Patchiness using Long-Range Correlation Measures”
G.M. Viswanathan, S.V. Buldyrev, S. Havlin and H.E.
Stanley
Biophysical Journal 72, 866 (1997)
48.
“Non-extensivity and multifractality in low-dimensional dissipative systems”
M.L. Lyra and C. Tsallis
Phys. Rev. Lett. 80, 53 (1998)
49.
“Long-range correlation measures for quantifying patchiness : Deviations from
uniform power-law scaling in genomic DNA”
G.M. Viswanathan, S.V. Buldyrev, S. Havlin and H.E. Stanley
Physica A 249, 581 (1998)
50.
“Scale-Invariant Correlations in the Biological and Social Sciences”
H.E. Stanley, L.A.N. Amaral, J.S. Andrade, Jr., S.V. Buldyrev, S. Havlin, H.A. Makse, C.-K. Peng, B. Suki and G.M.
Viswanathan
Phil. Mag. 7, 1373 (1998)
51.
“Analysis of DNA sequences using methods of statistical physics”
S.V. Buldyrev, N.V. Dokholyan,
A.L. Goldberger, S. Havlin, C.-K. Peng, H.E. Stanley and G.M. Viswanathan
52.
“Damage propagation in a diluted asymmetric neural network”
C.R. da Silva, L. da Silva and F.A. Tamarit
Int. J. Mod. Phys. C 9, 31 (1998)
53.
“The nature of electronic states in a disordered chain with long-ranged hopping amplitudes”
J.C. Cressoni and M.L. Lyra
Physica A 256, 18 (1998)
54.
“The spreading of damage and susceptibility in the quantum S=1/2 Heisenberg
ferromagnet”
U.M.S. Costa, I.V. Rojdestvenski and M.L. Lyra
Physical Review B 58, 2403 (1998)
55.
“Delocalization in the 1D Anderson model with long-range correlated disorder”
F.A.B.F. de Moura and M.L. Lyra
Phys. Rer. Lett. 81, 3735 (1998)
56.
“The electron localization problem via a local functional integral approach”
L.C. Botelho, E.P. da Silva, M.L. Lyra and S.B. Cavalcanti
Modern Physics Letters B, 12, 301 (1998).
1999
57. “Weak Chaos : Power-law sensitivity to initial conditions and
non-extensive thermostatistics”
M.L. Lyra
Ann. Rev. Comput. Phys. 6, 31 (1999).
58.
“Efficient Search of Critical Points in
Ising-Like Systems”
U.L. Fulco, L.S. Lucena and G.M. Viswanathan
Physica A 264, 171 (1999)
59.
“Low-dimensional non-linear dynamical systems and generalized entropy”
C.R. da Silva, H.R. da Cruz and M.L. Lyra
Braz. Jour. Phys. 29, 144 (1999).
60. “Correlation-induced
Metal-insulator transition in the 1D Anderson model”
F.A. B.F. de Moura and M.L. Lyra
Physica A, 266, 465 (1999).
61. “Circular-like maps : Power-law sensitivity, multifractality and
non-extensivity"
U. Tirnakli, M.L. Lyra and C. Tsallis
European Physical Journal B, 10, 309 (1999).
62. “Effective scaling behavior of magnetization and
Hamming distance in thin films under a surface field”
E.M.S. Luz, U.M.S. Costa and M.L. Lyra
European Physical Journal B 12, 115 (1999).
2000
63. “Damage spreading in the Potts model with cluster dynamics”
E.M. de Sousa Luz, M.P. Almeida, U.M.S. Costa and M.L. Lyra
Physica A 282, 176 (2000)
64. “Sensitivity
to initial conditions and on the physical meaning of the non extensivity
parameter”
U. Tirnakli, C. Tsallis and M.L. Lyra
Tr. J. of Physics (1999), in press.
65. “Optimizing Success
in Random Foraging : A Physical Approach”
G.M. Viswanathan , S.V. Buldyrev, S. Havlin, M.G.E.
da Luz, E.P. Raposo and H.E. Stanley
Preprint
66. “Effective BEG model of na alternate spin 1 spin 3/2 Ising chain”
E.C. Fireman and R.J.V. dos Santos
Preprint
67. “Thermo-kinetic Mathematical Theory of Prion diseases”
M.L. Galindo and R.J.V. dos Santos
Preprint.