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Wyświetlanie 1-15 z 37
Tytuł:
Magnetic Polaron Formation in Semimagnetic Semiconductor Heterostructures
Autorzy:
Yakovlev, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/1947113.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
71.35.+z
75.50.Rr
Opis:
We present a survey of experimental and theoretical studies of exciton magnetic polarons in semimagnetic semiconductor epilayers, quantum wells and superlattices. The emphasis is on dynamical aspects of magnetic polaron formation in systems of different dimensionality.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 703-714
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferromagnetic Behavior of a Short Period Antiferromagnetic Superlattice
Autorzy:
Wilamowski, Ż.
Jantsch, W.
Faschinger, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931944.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Fr
75.30.Et
71.35.+z
Opis:
We present a study of short period MnTe/CdTe superlattices by magnetic resonance. The usually antiferromagnetic structure exhibits critical line broadening above the Néel temperature typical of antiferromagnetic ordering, but also some ferromagnetic properties at lower temperature. We suggest that the observed ferromagnetic-like moment originates from coupling of the moments of the recently proposed strong magnetic polarons.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 185-188
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitonic Molecule in CuCl Crystal
Autorzy:
Ungier, W.
Powiązania:
https://bibliotekanauki.pl/articles/1929354.pdf
Data publikacji:
1993-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
Opis:
The electronic structure of a biexciton is discussed while taking into account the detailed band structure of CuCl. The fine structure of the excitonic molecule is clarified with the effective electron-hole exchange effect taken into account beyond the effective mass approximation. The electron-hole exchange interaction mixes the states of opposite parities with respect to the permutation of electrons and holes. Two trial envelope functions, symmetric and antisymmetric under the permutation of two electrons or two holes, were used in the numerical minimization of the ground state energy of the biexciton. The obtained binding energy of the biexciton, as well as, the ratio of the mixing of the trial envelope functions of opposite parities are presented.
Źródło:
Acta Physica Polonica A; 1993, 83, 6; 803-816
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitonic Molecule in Wurtzite Crystals
Autorzy:
Ungier, W.
Janiszewski, P.
Suffczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931241.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
Opis:
We calculate with the variational technique the fine structure of a biexciton in wurtzite crystals with the effective electron-hole exchange interaction taken into account. The values of the electron-hole exchange integrals are taken from the free exciton Γ$\text{}_{5}$-Γ$\text{}_{6}$ splitting. We calculate the biexciton dissociation energy and the ratio of mixing of the symmetric and antisymmetric envelopes which arises from the electron-hole exchange interaction. Results are presented for CdS, CdSe and ZnS crystals.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 607-613
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Samoloty o zmniejszonej skutecznej powierzchni odbicia
Autorzy:
Truskowski, Andrzej.
Powiązania:
Przegląd Sił Zbrojnych 2020, nr 1, s. 44-53
Data publikacji:
2020
Tematy:
Lotnictwo wojskowe
Samoloty trudnowykrywalne
Lockheed SR-71 Blackbird (samolot)
Rockwell B-1B Lancer (samolot)
Lockheed F-117 Nighthawk (samolot)
Lockheed Martin F-35 Lightning II (samolot)
Budowa i konstrukcje
Dane taktyczno-techniczne sprzętu wojskowego
Technologia stealth
Artykuł z czasopisma wojskowego
Opis:
Artykuł dotyczy samolotów zbudowanych w technologii Stealth. Autor artykułu omawia między innymi samoloty: Lockheed SR-71 Blackbird, Rockwell B-1B Lancer, Lockheed F-117 Nighthawk i Lockheed Martin F-35 Lightning II. Przedstawia ich budowę i dane taktyczno-techniczne.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Excitonic Instabilities of Deformable Lattice - from Self-Trapping to Phase Transition
Autorzy:
Toyozawa, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1931862.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.-i
71.35.+z
71.38.+i
Opis:
The optically created exciton will be self-trapped if its coupling to phonons is strong enough, and will moreover be self-decomposed if the electron and the hole couple to phonons in an opposite way. The bistability between the parity-conserved and parity-broken self-trapped excitons was observed in alkali halides. The situation is most dramatic if the bistability between the parity-broken self-trapped exciton and the ground state (with no exciton) comes into play since the electron-hole pairs may then be spontaneously generated at every lattice site, resulting in the electronic and structural phase transition. The neutral to ionic phase transition observed in a few organic charge transfer compounds under applied pressure or decreasing temperature can be considered as an example. Recent experiment revealed that TTF-chloranil, among others, is subject to photo-induced transient phase change over hundreds of unit cells per one photon. The dynamics of this process can be described in terms of self-trapping and self-multiplication of a photo-generated charge transfer exciton along the chain through the attractive dipolar interaction. This description of phase transition in terms of exciton dynamics will provide a new paradigm of materiology.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 47-56
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Nature of Eu-Related Emissions in ZnS and CaS
Autorzy:
Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:
https://bibliotekanauki.pl/articles/1879960.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
71.35.+z
78.55.Et
Opis:
The Eu-connected recombination processes in ZnS and CaS are analyzed on the basis of optical studies. A new Eu-related emission in ZnS is attributed to the recombination of an exciton bound at the Eu$\text{}^{2+}$ center, while in CaS the emission is dominated by the direct Eu$\text{}^{2+}$ intra-ion transition.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 255-257
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binding Energy of Muonium Hydride
Autorzy:
Suffczyński, M.
Wolniewicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1928258.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Gv
71.35.+z
Opis:
Binding energy of muonium hydride is calculated variationally with wave function dependent exponentially on three interparticle distances. The lower bound for the dissociation energy into the hydrogen atom and muonium is obtained as 3.853 eV. Expectation values of the interparticle distances are also calculated.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 157-159
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four- and Two-Wave Mixing in Solids
Autorzy:
Suchocki, A.
Gilliland, G. D.
Quarles, G. J.
Petrovic, M. S.
Powell, R. C.
Powiązania:
https://bibliotekanauki.pl/articles/1888054.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ma
71.35.+z
Opis:
The paper gives an overview of theory and presents several examples of application of some holographic techniques: four-wave mixing, self-scattering and beam coupling to study nonlinear optical properties of solids. Among them excitation energy transfer in chromium-doped vibronic laser materials and picosecond study of undoped CdTe are reported.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 207-219
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Exciton Zeeman Splittings in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te from Faraday Rotation Measurements
Autorzy:
Stachow, A.
Nguyen, The Khoi
Gaj, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/1933998.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
71.35.+z
Opis:
Reflectivity and Faraday rotation measurements were carried out on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals in the complete zinc-blende range of composition 0 < x ≤ 0.71. From a comparison of the results of these two experiments for samples with x ≤ 0.3, we demonstrate that the Faraday angle Θ, measured in limited spectral range, is proportional to the energy splitting of exciton states ΔE, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculate ΔE values also for x > 0.3. This allowed us to find an empirical description of ΔE values for the whole range of compositions as a function of B and x.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 909-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen-Like Excitations of 3d and 4f Isoelectronic Impurities in Semiconductors
Autorzy:
Sokolov, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1945561.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
78.20.Jq
78.20.Wc
78.50.Ge
Opis:
In the paper the energy states of structured isoelectronic impurities of transition metals and rare earth elements, donor and acceptor excitons of 3d and 4f impurities, the role of donor and acceptor excitons of 3d and 4f impurities in energy transfer from the matrix to impurities are discussed. It is shown that structured impurities may be classified as "open" and "closed" isoelectronic impurities. The number of electrons in the 3d or 4f shells is changed at hω < E$\text{}_{g}$ not changed structure levels generated by forbidden gap properties donor acceptor excitons those energy transfer mechanisms from matrix to an impurity (a capture carriers into 3d or 4f shells open and auger process essentially distinguished two kinds structured isoelectronic for closed impurities a model is discussed in frame which the spectra of electroabsorption photoluminescence cathodoluminescence are described.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 245-256
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fraction of Positronium Formation at Semiconductor Surface
Autorzy:
Shrivastava, S. B.
Upadhyay, A.
Powiązania:
https://bibliotekanauki.pl/articles/2010960.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
68.35.Fx
Opis:
The fraction of positronium formation (f$\text{}_{ps}$) has been calculated in Ge(110), Ge(111), Si(110) and Si(111) surfaces by solving the diffusion equation for positrons in semiconductors and by setting up the rate equation to describe the processes that are supposed to occur when a thermalised positron encounters the surface including the trapping of positrons in neutral and negative vacancies. Certain parameters used in the evaluation of f$\text{}_{ps}$, e.g., the bulk annihilation rate (λ$\text{}_{s}$), the positron diffusion length (L$\text{}_{+}$), the diffusion coefficient (D$\text{}_{+}$) and the implantation profile parameter (A), have been taken from the experiments. The calculated values of f$\text{}_{ps}$ as a function of incident positron energy and temperature in Ge(110) and Si(111) have been compared with the experimental results. It has been found that in general the calculated results are in good agreement with the experimental ones. The calculation also confirms that the trapping rate of positrons into negative vacancy has a T$\text{}^{-1}\text{}^{/}\text{}^{2}$ dependence with respect to the temperature.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 1005-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence Processes and Scintillation of CeF$\text{}_{3}$ Crystal Excited by UV and X-Ray Synchrotron Radiation
Autorzy:
Pédrini, C.
Belsky, A. N.
Moine, B.
Bouttet, D.
Powiązania:
https://bibliotekanauki.pl/articles/1929797.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
78.55.Hx
78.70.En
Opis:
Photoluminescence properties of CeF$\text{}_{3}$ have been investigated. Two kinds of emitting centers have been identified: regular Ce$\text{}^{3+}$ sites exhibiting two close emission bands (285 and 300 nm) and a fast fluorescence (20 ns) and several physically different perturbed Ce$\text{}^{3+}$ sites giving rise to a broad emission band near 340 nm and a longer fluorescence (30-40 ns) the decay time of which varies with wavelength. An energy transfer occurs between these two kinds of centers. Scintillation properties have been studied under UV and X-ray excitation. The additional fast decay always observed at short time under ionizing radiation is interpreted by a temperature dependent luminescence quenching phenomenon due to high excitation density.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 953-957
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos via Period-Doubling Oscillations in an Exciton-Carrier-Photon System Driven by Optical Pumping
Autorzy:
Nguyen, Ba An
Powiązania:
https://bibliotekanauki.pl/articles/1930622.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
71.35.+z
42.50.Lc
Opis:
A detailed stability analysis is performed for a highly excited semiconductor modelled as an exciton-electron-hole-photon system driven externally by optical pumping. Chaotic self-pulsations are shown to occur on both the upper and lower branches of the bistable steady state curve of the system via a sequence of period-doubling oscillation process. Such a route to chaos is well known in laser physics and in other nonlinear systems but not in highly excited semiconductors yet.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 541-552
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Triplet States and Triplet Excitons in Chemically Mixed Crystals of Acridine with Anthracene
Autorzy:
Morawski, O.
Prochorow, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933611.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.70.Ks
33.50.Dq
71.35.+z
Opis:
Spectral and temporal characteristics and their temperature dependence for the long-lived (phosphorescence and delayed fluorescence) emission of chemically mixed crystals of acridine II (host) with anthracene (guest) were studied under conditions of various spectral resolutions and different modes of excitation. The energy of 0-0 transitions of exciton band and of trap states have been determined and the nature and energy scheme of the triplet states of crystals have been established. The complex arrangement of host molecules into two different pairs in the crystal structure of acridine II is revealed in the energetic "doublet" structure of the trap states for both, the shallow and the deep traps (of acridine and of anthracene origin, respectively). Migration of triplet excitation energy in these chemically mixed crystals is controlled predominantly by the triplet-triplet annihilation of excitons (either heterogeneous or homogeneous) almost in the whole temperature range. The formation of triplet excimers of acridine was definitely ruled out.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 469-481
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 37

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