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Wyszukujesz frazę "Jantsch, W." wg kryterium: Autor


Tytuł:
Dyakonov--Perel Spin Relaxation Suppressed by an Applied Magnetic Field
Autorzy:
Wilamowski, Z.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/2036865.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Rb
73.21.Fg
85.75.-d
Opis:
We observe a strong anisotropy of spin relaxation and a decrease in the spin relaxation rate with increasing electron mobility in contrast to predictions of the classical D'yakonov-Perel spin relaxation model. We show that for high electron mobility the cyclotron motion causes an additional modulation of spin-orbit coupling, leading to an effective suppression of the spin relaxation rate.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 671-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erbium in Silicon: Possible Light Source for 1.5 μm and Challenge for Defect Physics
Autorzy:
Jantsch, W.
Przybylińska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1946605.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
Opis:
The trivalent erbium ion emits at 1.54 μm, independent of the host crystal and temperature. This fact makes Si:Er an interesting candidate for integrated optics in the optimum wavelength regime for fiber optic communication systems. Recent progress in improving the luminescence yield is reviewed and the limiting factors are discussed, namely: the low solubility of different Er centers, thermal quenching of the luminescence above 100 K, the mechanisms for energy transfer from the host crystal to the Er 4f shell and the process induced parasitic recombination channels.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 623-633
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of Nonuniform Line Broadening
Autorzy:
Wilamowski, Ż.
Przybylińska, H.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931943.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.20.+q
76.30.-v
Opis:
When the spin relaxation time of paramagnetic impurities at different magnetic sites differs by orders of magnitude then instead of resonance line broadening, rather a decay of the line amplitude is expected. In particular, the sp-d coupling of magnetic impurities to shallow impurities leads to a nonuniform distribution of the longitudinal relaxation rates of local spins.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 181-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Phenomena in Small Antiferromagnets
Autorzy:
Wilamowski, Z.
Buczko, R.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1964697.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.50.-y
Opis:
We show that the most characteristic properties of mesoscopic antiferromagnets can be explained in terms of the response on a spatially inhomogeneous perturbation. This concept allows to explain the dynamic properties (quantum resonance, coherence and tunnelling rates) as well as static perturbations which, for increasing size of an antiferromagnet, leads to a transition from the quantum mechanical oscillating system to a classical antiferromagnet with well defined Néel vectors.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 379-382
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:
Spin Resonance Absorption in a 2D Electron Gas
Autorzy:
Ungier, W.
Jantsch, W.
Wilamowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047694.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.-d
73.63.Hs
75.75.+a
76.30.-v
Opis:
We analyze the power absorption at electron spin resonance excited by the Bychkov-Rashba spin-orbit field in a 2D electron gas. We show that, as long as the absorbed power is dissipated by the usual spin lattice relaxation mechanisms, the resonance line shape is expected to be of pure absorption type, i.e., it can be described by the imaginary part of the dynamic magnetic susceptibility. Therefore, the Dysonian line shape observed in ESR of 2D electron gas cannot result from this type of the resonance signal.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 345-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DX Puzzle: Where Are We Now?
Autorzy:
Wilamowski, Z.
Suski, T.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1920958.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
71.55.-i
Opis:
A brief review of the experimental data on the metastable DX-centers in AlGaAs is presented. The experimental proofs of the two-electron nature and of the intermediate, one-electron state of the DX-centers are discussed. We collect the available experimental data on the ground state, electron-emission and capture energies and we discuss the nature of the lattice barrier. The effect of splitting of these energies in AlGaAs alloys and the consequences of the splitting on the capture and emission kinetics are analyzed. The different character of the barrier and of the alloy splitting for donors of the IV and VI group is underlined. The necessity to consider the interdonor Coulomb interaction when discussing the experimental data is also pointed out.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 561-571
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diluted Magnetic Semimetals - Beyond Heisenberg Coupling
Autorzy:
Wilamowski, Z.
Story, T.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931949.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
75.30.Hx
76.20.+q
Opis:
We analyse effects which cannot be explained assuming the isotropic Heisenberg form of sp-d or of the indirect d-sp-d (RKKY) coupling. Resonance line broadening, a line shift and an enhancement of the magnetic anisotropy in diluted magnetic semimetals are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 189-192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoconductivity in GaAlAs:Si Proves Negative U of DX Centers
Autorzy:
Wilamowski, Z.
Jantsch, W.
Ostermayer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1888154.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
71.55.-i
Opis:
The analysis of the temperature dependence of the photoconductivity, amplitude in doped GaAlAs, provides a simple and convincing proof of the negative sign of the Hubbard correlation energy U, strictly speaking of the two-electron nature of the thermal emission process from DX centers. The proof is based on a comparison of the emission activation energy measured per emission event (DLTS) with that measured per electron.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 283-286
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erbium Luminescence in Silicon
Autorzy:
Przybylińska, H.
Jantsch, W.
Palmetshofer, L.
Powiązania:
https://bibliotekanauki.pl/articles/1945472.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
Opis:
We report on high resolution photoluminescence investigations of Er-implanted Si and demonstrate the variety of Er centers or complexes with impurities and native Si-defects formed depending on the processing parameters. These centers are shown to differ in the efficiency of excitation transfer as well as high temperature photoluminescence yield. The mechanisms responsible for the photoluminescence quenching at different temperature regimes are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 83-92
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small Antiferromagnetic Clusters
Autorzy:
Buczko, R.
Wilamowski, Z.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1950740.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.50.Rr
Opis:
The analysis of the quantum mechanical model of mesoscopic size antiferromagnets shows that small antiferromagnets are characterized by a stronger exchange coupling and by an oscillating character of spins polarizations. Experimental evidence of the quantum character is discussed. We interpret the interlayer coupling in antiferromagnet superlattices and a puzzling resonance observed in nano-size antiferromagnet grains.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 747-750
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localized Spin Relaxation Due To Coupling To Effective Mass States
Autorzy:
Wilamowski, Z.
Dmochowski, J. E.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1968446.pdf
Data publikacji:
1997-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.50.-y
Opis:
The EPR of residual Mn in CdF$\text{}_{2}$ doped with Y, In and Ga is investigated. Although these donors are barely seen in EPR, they manifest themselves by a new effect: a drastic resonant reduction in the longitudinal relaxation rate of Mn which occurs only if the Zeeman splitting of the two subsystems coincide. In this situation, the saturation of those of the six Mn hyperfine lines is weakened which coincide with the shallow donor resonance.
Źródło:
Acta Physica Polonica A; 1997, 92, 5; 1055-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultra-Fast Spin Dynamics in Diluted Magnetic Semiconductors
Autorzy:
Wilamowski, Z.
Buczko, R.
Karczewski, G.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1952363.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.50.-y
Opis:
In nano-size antiferromagnetic systems a spatially inhomogeneous field leads to the formation of a staggered magnetization. Thereby the total magnetic moment does not change but the formation of a net magnetic moment at the border of the cluster leads to an energy gain. This type of magnetism is characterised by an ultra-fast dynamics. We suggest it is also responsible for the formation of the exciton magnetic polaron.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 969-972
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limitations in the Tunability of the Spin Resonance of 2D Electrons in Si by an Electric Current
Autorzy:
Wilamowski, Z.
Malissa, H.
Glazov, M.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/2047703.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.-d
73.63.Hs
75.75.+a
76.30.-v
Opis:
We analyse the recently observed effect of an in-plane electric current through a Si quantum well on the conduction electron spin resonance. We find that the ratio of resonance shift and current density is independent of temperature and dissipation processes, but the channel current is reduced due to a parallel electric channel in heavily modulation doped samples. The inhomogeneous current distribution results in some broadening of the ESR line width. In high mobility Si/SiGe layers the current induced increase in the electron temperature is considerably larger than the increase in the lattice temperature. The signal amplitude scales with the square of electron mobility.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 375-379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Spatial Fluctuation of Coulomb Potential in AlGaAs with DX Centers
Autorzy:
Wilamowski, Z.
Kossut, J.
Jantsch, W.
Ostermayer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1890983.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Dp
71.45.Jp
72.80.Ey
Opis:
Electric charges on randomly distributed impurities in semiconductors produce a spatially fluctuating potential. When the impurities are partially filled, their occupancy is not random but there appears a spatial correlation of the impurity charges appearing due to the inter-impurity Coulomb interactions. We show that when these interactions are taken into account then (i) the activation energy of the electron concentration, (ii) thermal emission kinetics, (iii) capture kinetics, (iv) persistent photoconductivity kinetics and (v) the electron mobility (in a steady state as well as during transients) in GaAlAs:Si can be explained in a consistent way. The energy diagram con cerning the DX center levels with respect to minima of the conduction band as well as the capture and emission barriers (including the effect of the alloy splitting) is constructed within an approach making use of the notion of the impurity self-screening.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 385-388
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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