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Wyświetlanie 1-15 z 28
Tytuł:
The Dielectric Studies of Ferroelectric [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ Crystals under Moderate Pressure
Autorzy:
Zdanowska-Frączek, M.
Olszewski, M.
Frączek, Z. J.
Jakubas, R.
Powiązania:
https://bibliotekanauki.pl/articles/2047740.pdf
Data publikacji:
2007-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
77.84.Fa
77.22.Ch
77.80.Bh
Opis:
The effect of pressure on the dielectric properties of [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ crystal was analyzed for a few values of hydrostatic pressure within the range from 0.1 MPa to 300 MPa and for temperatures from the range of 220-350 K. The measuring frequency was 1 kHz. The pressure-temperature phase diagram obtained was nonlinear. The temperature dielectric permittivity anomalies related to the paraelectric-ferroelectric phase transition temperature (T$\text{}_{c}$) gradually increase up to 66 MPa and then decrease with subsequent increase in pressure. The character of the temperature dielectric permittivity anomalies, typical of the continuous ferroelectric transition, remains unchanged with increasing pressure. Additionally, the pressure dependences of the Curie-Weiss constants for the crystal in paraelectric (C$\text{}_{+}$) and ferroelectric (C$\text{}_{-}$) phases were evaluated and discussed. The results indicated a complex mechanism of the ferroelectric phase transition.
Źródło:
Acta Physica Polonica A; 2007, 112, 3; 549-556
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Correlations and Electron-Molecular Vibration Coupling in Pentamerized Charge Transfer Crystals
Autorzy:
Yartsev, V. M.
Garrigou-Lagrange, C.
Powiązania:
https://bibliotekanauki.pl/articles/1933375.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
78.30.Jw
Opis:
A cluster approach is used for a theoretical description of the optical properties of pentamerized low-dimensional molecular crystals. Electronic correlations are taken into account explicitly in the Hubbard model for 1, 2, 3, 4 and 5 electrons in a linear pentamer, as well as coupling of electrons to the totally symmetric intramolecular vibrations. Calculated absorbance is compared to the measured one in pentamerized salt of TCNQ and TTF molecules.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 819-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Many-Exciton Complexes in Self-Assembled Quantum Dots
Autorzy:
Wójs, A.
Hawrylak, P.
Jacak, L.
Powiązania:
https://bibliotekanauki.pl/articles/1952721.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
71.45.Gm
78.66.Fd
Opis:
The system of interacting electrons and holes confined in a lens-shaped InGaAs self-assembled dot is studied using exact diagonalization techniques. The single-particle energy spectrum of self-assembled dot is well approximated by that of a quasi-two-dimensional atom with parabolic lateral confinement. The electronic shell structure of self-assembled dot is responsible for a remarkable dependence of the absorption/emission spectrum on the number of excitons. This is explained in terms of hidden symmetries leading to a formation of coherent many-exciton states of weakly interacting excitons and bi-excitons.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1108-1112
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Primary Role of Ionic Polarizability in Exotic Superconductivity
Autorzy:
Weger, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933315.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Kn
74.72.-v
72.15.-h
71.45.Gm
Opis:
The ionic polarizability of organic metals and of high-T$\text{}_{c}$ cuprates is very high while the density of conduction electrons is low. As a result, the ionic polarizability screens out the electronic polarizability for states very close to the Fermi surface. The cut-off is determined by the dispersion of the ionic polarizability. The electron-phonon matrix element is very large for the ionically screened states, and is the cut-off for the electronically screened states. Therefore, the McMillan coupling constant λ$\text{}_{ph}$ is very large at very low energies, and has a low energy cut-off. This model accounts for both normal and superconducting state anomalies in organic metals, as well as cuprates.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 723-733
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free-Carrier Plasmons as a Novel Tool in Semiconductor Physics
Autorzy:
Szuszkiewicz, W.
Bardyszewski, W.
Dingrong, Qian
Jiaming, Zhang
Julien, C.
Balkanski, M.
Witkowska, B.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1879491.pdf
Data publikacji:
1991-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
72.30.+q
75.50.Pp
Opis:
It is demonstrated that free-carrier plasmons being well defined collective excitations of the electron gas in the range of small wave vectors can serve as a sensitive tool to investigate the optical processes related to the small momentum transfers. As an example the system HgSe:Fe is analysed both experimentally and theoretically.
Źródło:
Acta Physica Polonica A; 1991, 79, 1; 141-144
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Impurity Charge Correlation on Free-Carrier Absorption
Autorzy:
Szuszkiewicz, W.
Sobkowicz, P.
Witkowska, B.
Bardyszewski, W.
Julien, C.
Balkanski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929654.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
72.30.+q
75.50.Pp
Opis:
Impurity-mediated free-carrier absorption was analyzed theoretically taking into account the possible spatial impurity correlations. The effect of correlations was included via the structure factor S(q) obtained from finite temperature Monte Carlo simulations of ordering in the impurity system. From the comparison of the experimental data with the results of calculations it is demonstrated that the ordering of charged centers exists for HgSe:Fe in a wide temperature range.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 559-562
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Plasmon-Phonon Coupling on the Electron-Impurity Interaction in the Free-Carrier Absorption
Autorzy:
Szuszkiewicz, W.
Bardyszewski, W.
Julien, C.
Powiązania:
https://bibliotekanauki.pl/articles/1877134.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
78.30.Fs
72.30.+q
Opis:
An experimental and theoretical evidence that the electron-impurity scattering is modified in the presence of the electromagnetic field oscillating with the frequency corresponding to the optical phonon energy is given. The coupled plasmon-phonon mode related feature in the reflectivity spectrum can be used to determine the upper edge of the LO phonon frequency band in highly doped materials.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 555-558
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma Edge Modification in Strongly Compensated Semiconductors
Autorzy:
Szuszkiewicz, W.
Dybko, K.
Bardyszewski, W.
Julien, C.
Powiązania:
https://bibliotekanauki.pl/articles/1943840.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.30.+q
71.45.Gm
78.30.Fs
Opis:
We demonstrate that the electron-impurity interaction can modify the reflectivity in the vicinity of plasma minimum giving rise to a small dip on the plasma edge. Experimental spectra taken for Hg$\text{}_{1-x}$Co$\text{}_{x}$Se for x < 0.02 at various temperatures confirm this theoretical prediction. The position of the structure can be used to determine the plasma frequency in highly compensated materials at low temperatures.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1048-1052
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Liquids in Coupled Quantum Wells
Autorzy:
Świerkowski, L.
Szymański, J.
Neilson, D.
Powiązania:
https://bibliotekanauki.pl/articles/1929610.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Lq
71.45.Gm
71.45.Lr
Opis:
A system comprising of two adjacent layers of conduction electrons or alternatively a layer of electrons and a layer of holes can exhibit novel instabilities in the liquid phase towards inhomogeneous ground states. The carriers in the two layers can couple to each other through the Coulomb interaction but they are not permitted to tunnel so that the charges in one layer act as a polarisable background for the other layer. The presence of a second layer encourages the formation of novel ground states with inhomogeneous density distributions. We find theoretical evidence for the existence of charge density wave ground states and also a coupled Wigner crystal. These exist at much higher densities than the Wigner crystallisation density for the single layer case. The existence of these inhomogeneous ground states leads to significant modifications of the low lying excitation spectrum in the uniform liquid phase. Near the transitions to both the charge density wave and the coupled Wigner crystal phases we find evidence of the development in the liquid phase of new soft mode excitations of finite wave number q that are precursors of the inhomogeneous ground states. Near the transition to the coupled Wigner crystal we observe a strong tendency of the single particle excitation spectrum for the liquid phase to renormalise into a single line that has a dispersion closely resembling the phonon dispersion curve for the solid.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 445-457
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties and Electron Spectrum of the Müller Model in the High-Temperature Superconductivity Theory
Autorzy:
Stasyuk, I. V.
Shvaika, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1929563.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.65.+n
71.45.Gm
Opis:
The paper is devoted to the investigation of the single-electron excitation spectrum, effective exchange interaction and dielectric susceptibility of the Muller model for high-temperature superconductivity. It is shown that the interaction with the anharmonic vibration mode leads to the additional splitting of the electron bands and their narrowing. The sign of the effective exchange interaction between electrons depends on the local state of the vibration subsystem. The electron and pseudospin (lattice) contributions to the transverse dielectric susceptibility are investigated.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 293-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Spectrum and Dieleclric Susceptibility of the Hubbard Model with Local Lattice Anharmonicity
Autorzy:
Stasyuk, I. V.
Shvaika, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1930577.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.Mn
71.45.Gm
Opis:
The investigation of single-electron spectrum of the Hubbard model with local lattice anharmonicity is performed. The influence of the interaction with the vibrational subsystem on the effective exchange constant is considered. The static transverse dielectric susceptibility of the model is calculated. Analysis of the possible dielectric anomalies is performed on this basis.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 363-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Simulations of Spatial Correlations of Charged Centers in δ-Doped Layers
Autorzy:
Sobkowicz, P.
Wilamowski, Z.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1921559.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
73.20.Dx
71.45.Gm
Opis:
Results of Monte Carlo simulations of a 2D system of charged donors are presented. They enable to study the effects related to a spatial correlation of donor charges located on a random donor matrix. A qualitative difference between DX$\text{}^{+}$ and DX¯ models is observed. In the first case, strong temperature dependence of the correlations and a "freezing-like" behaviour is found. The origin of the freezing is traced to the random distribution of donor sites by comparing the system with a liquid-like model where the charges may assume arbitrary positions within a plane. In the second case only nearest-neighbour correlations are observed. The simulations have direct application in analysis of the behaviour of the DX centers in the GaAs planarly doped with Si.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 645-648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static Local Field Factor and Ground State Properties of Interacting Electron Gas
Autorzy:
Sarkar, A.
Haldar, S.
Roy, D.
Sen, D.
Powiązania:
https://bibliotekanauki.pl/articles/2038378.pdf
Data publikacji:
2004-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.-w
71.45.Gm
Opis:
In the most general case, the calculation of the static local field factor G(q) for the unpolarised electron gas requires the knowledge of exchange-correlation energy functionals for both the parallel and antiparallel relative spin orientations of the electron gas system. Accurate density interpolation formulae using the quantum Monte Carlo data of Ceperley-Alder for the correlation energy of electron gas in both the "para" and "ferro" states, respectively, in the given density range are used for the calculation of G( q). Fulfilment of relevant consistency criteria is ensured and the local field factor so obtained renders significant improvement of ab initio pseudopotential calculation of effective interaction of Al. The Levin like interpolant of the correlation energy Ceperley-Alder data has been further used to study the ground state properties of the electron gas. It is also noted that a better understanding of the interacting electron gas properties requires a more accurate spin interpolation formula for the correlation energy than the existing ones.
Źródło:
Acta Physica Polonica A; 2004, 106, 4; 497-514
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nonequilibrium Plasmons on Electron-Plasmon Interactions in Semiconductors
Autorzy:
Popov, V. V.
Bagaeva, T. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/1968414.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
72.10.Di
Opis:
The effect of nonequilibrium plasmons on the steady-state high-dc-field response of electron gas in n-GaAs is numerically studied via iterative procedure using the Monte Carlo simulation algorithm for hot-electron transport and the Boltzmann equation for plasmons. The electron population inversion in wave vector space along the electric field is predicted to exist for fields in excess of about 10 kVcm. The plasmon distribution disturbances leave the steady-state velocity at low fields almost unaffected but lead to reduction of that up to 10% for fields around and above the maximum of the velocity-field characteristics.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 963-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Absorption in Periodic InN:In Structures
Autorzy:
Plotnikov, D. S.
Shubina, T. V.
Jmerik, V. N.
Semenov, A. N.
Ivanov, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/2047375.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.-w
71.45.Gm
Opis:
Optical absorption measurements were exploited to study periodic InN:In structures grown by plasma-assisted molecular beam epitaxy with the thickness of the metallic inclusions varied from 2 to 48 monolayers. We demonstrate that the observed higher-energy shift of an effective absorption edge may be due to In depletion of the InN matrix via the coalescence of In into large clusters, accompanied by the respective higher-energy shift of the Mie resonance. The relevant uncertainty in the optical gap of InN is discussed.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 191-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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