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Wyświetlanie 1-15 z 36
Tytuł:
Mixed State in t-U-J-V Model
Autorzy:
Tobijaszewska, B.
Bak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1810406.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.-z
74.20.Rp
74.25.Dw
71.10.Fd
71.27.+a
Opis:
The t-U-J-V model in the U → ∞ limit is treated by renormalized mean-field theory for arbitrary electron density. Superconductivity of s+id symmetry is found in the large parts of the phase diagram. Calculations also show a possibility of phase separation.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 135-137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One-Dimensional Tasaki-Hubbard Model in Paramagnetic Limit
Autorzy:
Baliha, V.
Richter, J.
Derzhko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030091.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
flat-band Hubbard model
paramagnetism
Opis:
The one-dimensional Tasaki-Hubbard model belongs to the class of flat-band ferromagnets. By introducing an infinitesimally small external magnetic field, we examine the properties of the model in the paramagnetic regime. We compare and contrast them to the properties of the conventional Curie paramagnet.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1256-1260
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Model for the Surface Phenomena
Autorzy:
Wojtczak, L.
Powiązania:
https://bibliotekanauki.pl/articles/1929332.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.15.+t
68.45.-v
Opis:
The simplicity of the present model consists in the construction of the Hamiltonian based on the models of quasi-harmonic oscillators coupled to quasi-free electrons with the effective parameters which are estimated by means of the pseudoharmonic approach and coherent potential approximation, respectively. The geometry of a sample is determined by the topological disorder at the surface reflecting the surface roughness. The model is discussed in connection with the friction related to the melting and pre-melting phenomena. The backscattering of electrons seems to be a testing tool useful not only for decorated surfaces but also for quasi-liquid layers.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 685-699
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple Model for Elucidation the Nature of Current-Generating Processes in Polyaniline-Type Conductive Polymers
Autorzy:
Barsukov, V. Z.
Chivikov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/1933407.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ph
Opis:
According to suggested simple model in the practically important potential range (E ≈ 0... + 0.6 V against SHE) the nature of the electrochemical current-generating processes in conductive polymers of polyaniline type is not associated with a particular redox reaction, but it reduces to the charge/discharge of the double electric layer capacity, which is anomalously high (300... 850 F/g) in such systems due to structural peculiarities of these materials. The model gives a good fit to electrode behavior in this range.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 905-908
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground-state spin of Hubbard ladder model with infinite electron repulsion
Autorzy:
Cheranovskii, V.
Ezerskaya, E.
Klein, D.
Tokarev, V.
Powiązania:
https://bibliotekanauki.pl/articles/1054813.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
75.10.Jm
Opis:
We apply perturbation theory and cyclic spin permutation formalism to study the lowest energy states of the infinite-repulsion Hubbard model on n-leg ladders with alternating values of one-site energies α_{i} for neighboring rungs. We establish the "ferromagnetic" character of ladder ground-state at electron densities in the interval 1 - (2n)¯¹ ≤ ρ ≤ 1 and sufficiently large alternation of one-site energies of neighbor rungs of the ladder. We also show the stability of this state against the small deviations of the values of α_{i} in contrast to the case of two-leg ladder formed by weakly interacting neighbor rungs with equal one-site energies.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 916-918
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertex Corrections to the Electrical Conductivity of the Disordered Falicov-Kimball Model
Autorzy:
Pokorný, V.
Janiš, V.
Powiązania:
https://bibliotekanauki.pl/articles/1534607.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.28.+d
72.10.Fk
Opis:
Quantum coherence of elastically scattered lattice fermions is studied. We calculate vertex corrections to the electrical conductivity of electrons scattered either on thermally equilibrated or statically distributed random impurities and we demonstrate that the sign of the vertex corrections to the Drude conductivity is in both cases negative.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 922-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Paramagnetic Resonance and Superposition Model Analysis of Zero Field Splitting for Mn$\text{}^{2+}$ in Double Nitrates
Autorzy:
Jain, V. K.
Prakash, V.
Powiązania:
https://bibliotekanauki.pl/articles/1929829.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
Opis:
Electron paramagnetic resonance of Mn$\text{}^{2+}$ in La$\text{}_{2}$Zn$\text{}_{3}$(NO$\text{}_{3}$)$\text{}_{12}$ • 24H$\text{}_{2}$O single crystals is studied at ≈ 9.45 GHz. Mn$\text{}^{2+}$ substitutes for Zn$\text{}^{2+}$ sites. The spin-Hamiltonian parameters are evaluated at 290 K. The superposition model has been applied to the zero-field splitting parameter D for Mn$\text{}^{2+}$ in Ce$\text{}_{2}$Mg$\text{}_{3}$(NO$\text{}_{3}$)$\text{}_{12}$ • 24H$\text{}_{2}$O and La$\text{}_{2}$Mg$\text{}_{3}$ (NO$\text{}_{3}$)$\text{}_{12}$ • 24D$\text{}_{2}$O at both sites. It is shown that the calculated values of D are in agreement with the experimental values if local relaxation effects are taken into account.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1111-1115
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Investigations of Model Neuromelanins
Autorzy:
Skrzypek, D.
Dzierżęga-Lęcznar, A.
Ziółkowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2014422.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.-v
76.30.Rn
Opis:
The aim of this work was to compare free radical properties of some model neuromelanins obtained from dopamine and its mixture with 5-S-cysteinyldopamine in various molar ratios. The EPR method was used in these investigations; the samples were detected at X and K bands. The parameters of EPR spectra, free radicals concentrations in air and in vacuum, the influence of microwave power and temperature on intensity of resonance signals were measured.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 561-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of the Model of Formation of Radiolytic Products in Aqueous Solutions
Autorzy:
Stepanov, S. V.
Byakov, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/2042192.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Fe
36.10.Dr
78.70.Bj
Opis:
Mathematical model of formation of radiolytic products (e$\text{}_{aq}^{-}$, H, OH, H$\text{}_{2}$, H$\text{}_{3}$O$\text{}^{+}$, OH$\text{}^{-}$, Ps) in water is developed. It takes into account (1) reactions between dissolved scavengers of thermalized and hydrated electrons as well as epithermal ones; (2) ambipolar diffusion expansion of the intratrack species; (3) additional channels of Ps and H$\text{}_{2}$ formation due to appearance of weakly trapped electrons. Good agreement is obtained with experimental data on kinetics of accumulation of the products in pure water and their concentration variations in aqueous solutions.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 651-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simplified Parquet Equations for the Anderson Impurity Model: Comparison with Numerically Exact Solutions
Autorzy:
Pokorný, V.
Žonda, M.
Kauch, A.
Janiš, V.
Powiązania:
https://bibliotekanauki.pl/articles/1032140.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
72.15.Qm
74.40.Kb
Opis:
We use an analytic solver for the single-impurity Anderson model based on simplified parquet equations to describe the Kondo asymptotics. This scheme uses a two-particle self-consistency to control the strong-coupling Kondo critical behavior of this model at half filling. The equations can be written in the real-frequency representation, which gives us direct access to spectral functions unlike numerical schemes in the Matsubara formalism. We compare our results to those obtained by second-order perturbation theory, numerical renormalization group, and continuous-time quantum Monte Carlo in order to assess the reliability of this approximation.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1042-1044
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological Model of Austenite-Martensite Interfaces in Cu-Al-Ni Alloy
Autorzy:
Ostapovets, A.
Zarubova, N.
Paidar, V.
Powiązania:
https://bibliotekanauki.pl/articles/1418493.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.70.+h
Opis:
Discussion of the austenite-single-variant martensite interfaces in Cu-Al-Ni alloy is performed in the frame of a topological model of martensite interfaces. This model takes into account admissible defects lying in the interface. The results are compared with the experimental data obtained on the foils of Cu-Al-Ni alloys deformed in situ in a transmission electron microscope.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 493-496
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics of Pseudospin-Electron Model in the U=0 Limit
Autorzy:
Stasyuk, I. V.
Shvaika, A. M.
Tabunshchyk, K. V.
Powiązania:
https://bibliotekanauki.pl/articles/2013013.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.38.+i
77.80.Bh
63.20.Ry
Opis:
Analytical consideration of a pseudospin-electron model in the absence of electron correlations is presented. Pseudospin and electron number mean values, thermodynamic potential, pair correlation functions are obtained in the same self-consistent approximation. The possibility of either first or second order phase transitions between different uniform phases (bistability) as well as between the uniform and the chessboard one is shown. In the regime n=const, an instability with respect to phase separation can take place.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 411-414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells
Autorzy:
Astakhov, G. V.
Kochereshko, V. P.
Kosobukin, V. A.
Yakovlev, D. R.
Wojtowicz, T.
Karczewski, G.
Kossut, J.
Ossau, W.
Landwehr, G.
Powiązania:
https://bibliotekanauki.pl/articles/1969005.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.66.-w
Opis:
An approach is proposed to estimate separately parameters of homogeneous and inhomogeneous broadenings from an optical reflection line of a quasi-2D exciton. A phenomenological model is proposed to take into account statistically an inhomogeneous broadening of the exciton resonant spectra. The concept is applied to study a modulation-doped heterostructures with a single quantum well CdTe/CdMgTe. From exciton reflection lines taken in a magnetic field the temperature-dependent homogeneous and inhomogeneous broadening parameters as well as the exciton radiative decay rate are measured.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 235-239
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetooptics of III-V Compounds in Many Band Model Approach
Autorzy:
Obuchowicz, A.
Wlasak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1886749.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
61.50.Em
71.55.-i
Opis:
III-V semiconducting compounds in the presence of a magnetic field are considered. The 14 x 14 effective hamiltonian in the frame of 5-level model is obtained. Directional dependence of selection rules are obtained. Shallow donor levels in the frame of spherical 3-level model are also considered. New trial functions suitable for a whole range of magnetic field are proposed. It is found that the energy as well as the variational function of each magnetodonor level is a continuous function of the magnetic field.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 329-332
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gibbs Sampling in Inference of Copula Gaussian Graphical Model Adapted to Biological Networks
Autorzy:
Purutçuoğlu, V.
Farnoudkia, H.
Powiązania:
https://bibliotekanauki.pl/articles/1031489.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.-R
02.50.-T
Opis:
Markov chain Monte Carlo methods (MCMC) are iterative algorithms that are used in many Bayesian simulation studies, where the inference cannot be easily obtained directly through the defined model. Reversible jump MCMC methods belong to a special type of MCMC methods, in which the dimension of parameters can change in each iteration. In this study, we suggest Gibbs sampling in place of RJMCMC, to decrease the computational demand of the calculation of high dimensional systems. We evaluate the performance of the suggested algorithm in three real benchmark datasets, by comparing the accuracy and the computational demand with its strong alternatives, namely, birth-death MCMC, RJMCMC and QUIC algorithms. From the comparative analyses, we detect that Gibbs sampling improves the computational cost of RJMCMC without losing the accuracy.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1112-1117
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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