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Wyświetlanie 1-15 z 96
Tytuł:
Excitonic Spectra of Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te Crystals
Autorzy:
Permogorov, S. A.
Tenishev, L. N.
Surkova, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/1921609.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
Strong modification of the optical spectra near the band-gap edge is observed in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te crystals as compared to the spectra of a pure compound. The evolution of the luminescence spectra at the increase in Fe concentration is represented by the change of radiative recombination channels from dominantly (A$\text{}^{0}$, x) acceptor bound exciton emission in undoped CdTe to the free exciton luminescence in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te solid solutions.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 702-704
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy States of Ni in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se:Ni Solid Solutions
Autorzy:
Permogorov, S. A.
Tenishev, L. N.
Sokolov, V. I.
Surkova, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/1921612.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.50.Ge
Opis:
Absorption and reflectivity measurements were carried out on Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se:Ni solid solutions. The spectra demonstrate the radical change of the structure of internal Ni$\text{}^{2+}$(3d$\text{}^{8}$) transitions at the presence of the Mn ions and strong dependence on Mn concentration. The threshold energy ħω$\text{}_{th}$ for the process of Ni photoionization to the valence band Ni$\text{}^{2+}$(3d$\text{}^{8}$) + ħω$\text{}_{th}$ → Ni$\text{}^{1+}$(3d$\text{}^{9}$) + h is shifted to the lower energy by 30 meV, but hardly depends on x despite the essential increase in the energy gap.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 705-708
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free Exciton Luminescence in ZnCdSe Solid Solutions, ZnSe Epitaxial Films and ZnSe$\text{}_{1-x}$S$\text{}_{x}$/ZnSe$\text{}_{1-y}$S$\text{}_{y}$ Superlattices
Autorzy:
Tenishev, L. N.
Permogorov, S. A.
Fedorov, D. L.
Yakushcheva, G. G.
Kuznetsov, P. I
Powiązania:
https://bibliotekanauki.pl/articles/1952205.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
We studied the luminescence of bulk Zn$\text{}_{1-x}$Cd$\text{}_{x}$Se solid solutions, epitaxial ZnSe films and ZnSe$\text{}_{1-x}$S$\text{}_{x}$/ZnSe$\text{}_{1-y}$S$\text{}_{y}$ superlattices at T=2-80 K. The analysis of the bands of exciton radiative annihilation with simultaneous emission of 1 or 2 LO phonons shows that the excitons in the studied samples can be considered as free particles with thermalized distribution of kinetic energies. In ZnSe$\text{}_{1-x}$S$\text{}_{x}$/ZnSe$\text{}_{1-y}$S$\text{}_{y}$ superlattices a three-dimensional character of exciton motion was established. The periodic potential of superlattice perturbs the exciton wave vector and induces additional elastic scattering of excitons.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 959-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fine Structure of Resonant-Tunneling Peak in GaAs/AlAs Double-Barrier Heterostructure
Autorzy:
Vitusevich, S. A.
Figielski, T.
Mąkosa, A.
Wosiński, T.
Belyaev, A. E.
Konakova, R. V.
Kravchenko, L. N.
Powiązania:
https://bibliotekanauki.pl/articles/1872937.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
85.30.Mn
Opis:
For the first time we observed a fine oscillatory structure, with the period of 36 mV, of the resonant tunneling peak in the current-voltage characteristic of a double-barrier heterostructure. We attribute it to a sequential single-phonon emission of ballistic electrons which tunneled out from the quantum well through the collector barrier.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 377-380
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunnel Current Features Caused by Defect Assisted Process in Resonant-Tunnelling Structures
Autorzy:
Belyaev, A. E.
Vitusevich, S. A.
Glavin, B. A.
Konakova, R. V.
Dobrowolski, W.
Mąkosa, A.
Kravchenko, L. N.
Gornev, E. S.
Powiązania:
https://bibliotekanauki.pl/articles/1947897.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
85.30.Mn
Opis:
An extra channel of electron tunnelling through a double-barrier resonant-tunnelling GaAs/AlGaAs heterostructure caused by impurity assisted tunnelling was identified. We argue that it is due to DX centres associated with dopant donor atoms which diffused into the AlGaAs barrier layer.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 727-730
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Quantum Signature of Chaos through the Dynamics of Entanglement in Classically Regular and Chaotic Systems
Autorzy:
Chew, L.
Chung, N.
Powiązania:
https://bibliotekanauki.pl/articles/1492762.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Mt
03.67.Bg
03.67.Mn
Opis:
We demonstrate the dependence of the entanglement dynamics on the global classical regime of regular, mixed and chaotic dynamics with initial squeezed coherent states. By squeezing the initial states, we are able to enhance or suppress the entanglement entropy of the dynamically generated quantum states relative to those produced via initial coherent states. This suggests the possibility of exploiting a judicious selection of initial squeezed states to create quantum states with enhanced entanglement entropy dynamically for the purpose of robust quantum information processing.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-095-A-099
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study between Energy Levels of $Cr^{3+}$ and $Co^{2+}$ Ions Doped in $MgF_{2}$ Crystal
Autorzy:
Nistora, R.
Andreici, L.
Avram, N.
Powiązania:
https://bibliotekanauki.pl/articles/1791222.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
42.70.Hj
61.72.S-
Opis:
The aim of this paper is to present a comparison of the energy level schemes of $Cr^{3+}$ ($3d^{3}$ electrons) and $Co^{2+}$ ($3d^{7}$ electrons), each of ions doped, separately, in $MgF_{2}$ crystal. We report on the detailed and consistent crystal field analysis of $Cr^{3+}$ spectra in $MgF_{2}$ crystal and compare with results, previously obtained, for $Co^{2+}$, doped in same host matrix. The results are based on application of the exchange charge model of crystal field to the calculation of crystal field parameters and energy levels of both ions doped in $MgF_{2}$.The calculations have been performed on previously optimized geometry of $MgF_{2}$ crystal. The obtained results are compared with experimental data and discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoelastic Phenomena in Stressed Laser Heterostructures
Autorzy:
Kulakova, L.
Averkiev, N.
Lutetskiy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1383501.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
78.20.Bh
78.20.hb
Opis:
The theoretical analysis of optical properties change in cubic crystals caused by simultaneous action of longitudinal and shear strains due to the photo-elastic interaction has been performed. The polarization characteristics change of a primary linear polarized light wave during propagation in the crystal has been studied. Results of the calculations were used to analyze photo-elastic phenomena in stressed heterostructures at the introduction of an alternating shear strain. The comparison of photo-elastic and acousto-electron phenomena in the laser heterostructures has been fulfilled. The results have been confirmed by the experiments in the InGaAs/GaAs structures at the action of shear strains excited by the ultrasonic waves.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 87-89
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production and Structural Investigation of Polyethylene Composites with Modified Kaolin
Autorzy:
Domka, L.
Malicka, A.
Stachowiak, N.
Powiązania:
https://bibliotekanauki.pl/articles/1812252.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.25.-g
63.22.Np
68.37.Hk
81.07.Pr
82.35.Np
Opis:
The study was undertaken to evaluate the effect of the filler (kaolin) modification with silane coupling agents on the properties of the polyethylene (HDPE Hostalen ACP 5831) composites. Powder mineral fillers are added to polymers to modify the properties of the latter and to reduce the cost of their production. A very important factor is the filler dispersion in the polymer matrix. Kaolin modified with 3-methacryloxypropyltrimethoxysilane and pure kaolin were characterised by surface area, pore size, water absorbing capacity, paraffin oil absorbing capacity, bulk density, scanning electron microscopy observations and X-ray diffraction measurements. Their performance was characterised by determination of the mechanical resistance upon static stretching and tearing, and their structure was observed in scanning electron microscopy images. The results were compared to those obtained for the composites with unmodified filler and pure HDPE.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 413-421
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collisional Line Shapes in the Presence of Broad-Band Squeezed Vacuum
Autorzy:
Cong, N. H.
Vinh, L. V.
Powiązania:
https://bibliotekanauki.pl/articles/2025783.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Lc
42.50.Ct
Opis:
In this paper we discuss the line shapes of a two-level atom in the presence of broad-band squeezed vacuum and collisional broadening. We describe the collisions and the squeezed vacuum using a stochastic model of Rabi amplitude fluctuations. From such a stochastic description the fast and the slow damping rates of the Bloch polarizations are obtained. The strong field resonance fluorescence spectrum in the presence of stochastic broad-band squeezed vacuum and collisions is derived.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 545-555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Atomic and Electronic Structure of a Tip on Stm Images
Autorzy:
Jurczyszyn, L.
Mingo, N.
Flores, F.
Powiązania:
https://bibliotekanauki.pl/articles/1968715.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.79.Cz
61.16.Ch
Opis:
Theoretical studies of the influence of electronic and atomic structure of a tip on scanning tunneling microscopy images are presented. Results are discussed for the scanning of Al(001) and Al(001)+Xe surfaces performed within aluminum and nickel tips of a different geometry.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 307-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties and Photoemission of Microrelief Surfaces of III-V Semiconductors
Autorzy:
Dmitruk, N. L.
Mamikin, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/1931741.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Ns
68.35.Bs
78.30.Fs
Opis:
The optical properties (infrared reflectance) and the photoemission current for the surface-barrier structures of metal-semiconductor type with microrelief interface have been investigated. The participation of surface plasmon polaritons in internal photoemission of the Au-GaAs Schottky barriers has been observed.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Evolution Reaction on the Oxidized Surfaces of the Fe-Based Amorphous Alloys
Autorzy:
Danyliak, M.
Boichyshyn, L.
Pandiak, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031001.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
amorphous alloys
oxidized surfaces
rare-earth metals
hydrogen evolution reaction
electrocatalysis
Opis:
Electrochemical hydrogen evolution on oxidized electrodes of the amorphous metallic alloys Fe₈₂Nb₂B₁₄RE₂ (RE = Tb, Dy) in 5.0 M KOH aqueous solution in the temperature range 298-313 ± 0.5 K has been investigated. A sample Fe₈₄Nb₂B₁₄ was used as reference alloy. The highest corrosion resistance during multiple scanning of the potential exhibited the alloys doped by terbium and dysprosium. High values of the exchange currents, characterizing catalytic ability and corrosion resistance characterize Fe₈₂Nb₂B₁₄RE₂ amorphous alloys as promising electrode materials for hydrogen evolution reaction.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1103-1107
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Nitride Thin Films Using SEM and EDX
Autorzy:
Mammeri, F.
Chekour, L.
Rouag, N.
Powiązania:
https://bibliotekanauki.pl/articles/1399799.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.25.dp
68.55.J-
81.15.-z
68.37.Hk
68.90.+g
Opis:
The chromium nitride thin films have became more and more popular in the last years because of their very good physical, chemical and mechanical properties. The present study relates to thermal stability of hard thin films of chromium nitride CrN, carried out physical vapour deposition. We studied the influence of the annealing temperature on the morphology of CrN films, deposited on silicon substrate using magnetron sputtering. The characterizations are examined using scanning electron microscope equipped with energy dispersive X-ray spectroscopy. Annealing treatments in $N_2$ at 600-1000C for 1 h are performed on CrN coating samples for 530 nm thickness. At low temperature, the results show a thermal stability of these coatings. The $Cr_2O_3$ phase is completely replaced by the CrN phase at temperature above 1000°C. The results given by scanning electron microscopy-energy dispersive X-ray spectroscopy and X-ray diffraction are compared.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 294-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Edge Pinning Effects and Giant Thermal Instability of Magnetization Hysteresis Loops in Thin Nano-Scale Magnets
Autorzy:
Popkov, A. F.
Savchenko, L. L.
Vorotnikova, N. V.
Powiązania:
https://bibliotekanauki.pl/articles/2013138.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
67.80.Jd
Opis:
Magnetization reversal modes of super-thin nano-scale particles with a high magnetization and low anisotropy are analyzed by solving magnetic moment motion equations. A new kind of thermal hysteresis instability connected with the random mutual transformation of the main magnetization modes is predicted by simulations.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 499-502
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 96

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