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Wyświetlanie 1-15 z 1177
Tytuł:
Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe
Autorzy:
Lawrence, I.
Feuilet, G.
Tuffigo, H.
Bodin, C.
Cibert, J.
Rühle, W. W.
Powiązania:
https://bibliotekanauki.pl/articles/1861487.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Hf
78.20.Ls
78.47.+p
Opis:
Carrier tunneling through CdMnTe barriers of different thicknesses is investigated in CdTe/CdMnTe asymmetric double quantum wells. Steady-state photoluminescence at 1.8 K and time-resolved photoluminescence experiments between 10 K and 50 K were performed.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 637-640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Effects in Spin-Wave Spectrum of the Semi-Infinite FeBr$\text{}_{2}$ Field-Induced Metamagnet
Autorzy:
Rudziński, W.
Maciejewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1930606.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Kz
Opis:
Surface spin waves in the layered structure of the FeBr$\text{}_{2}$ field-induced metamagnet are studied theoretically. Surface spin-wave modes are calculated for the (001) surface and for the paramagnetic phase at low temperatures. Allowing the surface exchange parameters to deviate from the bulk values, full richness of the surface spin-wave spectra is displayed. The problem of the stability of the ground state of the system is also discussed.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 433-437
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Curie Temperature and Magnetization of Finite Superlattice with Random Irregularities
Autorzy:
Maciejewski, W.
Reich, W.
Powiązania:
https://bibliotekanauki.pl/articles/1930613.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
Opis:
The Curie temperature and layer magnetization of ferromagnetic superlattices with random irregularities in modulation amplitude, thickness of layers and width of interdiffusion zones are studied in an extended version of the Kirkwood approximation. It is found that the increase of the deviation in the modulation amplitude gives rise to localized magnetism and the significant increase in the Curie temperature.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 469-473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peierls Instability and Charge-Density-Wave Transport in Fluoranthene and Perylene Radical Cation Salts
Autorzy:
Brütting, W.
Riess, W.
Powiązania:
https://bibliotekanauki.pl/articles/1933357.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Lr
71.30.+h
72.10.Bg
72.80.Le
Opis:
Fluoranthene and perylene radical cation salts are quasi-one-dimensional conductors, which show a Peierls transition to a charge-density-wave ground state. Radical cation salts with different stoichiometries composed of the aromatic donor molecules fluoranthene (Fa = C$\text{}_{16}$H$\text{}_{10}$) or perylene (Per = C$\text{}_{20}$H$\text{}_{12}$) and the counterion X¯ = PF¯$\text{}_{6}$ were investigated. We find that the temperature dependence of the electrical conductivity and the properties in the charge-density-wave ground state strongly depend on the composition of the crystals. When fluoranthene is replaced by perylene, the Peierls transition is shifted from 180 K to 120 K and the ground state energy gap decreases from values of 120-180 meV to 60-80 meV. In the charge-density-wave ground state the threshold field for nonlinear conductivity varies between 0.1 and 1 V/cm for different systems. Our results indicate that disorder, three-dimensional coupling and commensurability effects play an important role for the transport properties of these systems.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 785-790
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Problem of Scale in Electric Metrology of Nanostructures in the Context of the New SI Redefinition of the Base Electric Unit
Autorzy:
Chyla, W.
Powiązania:
https://bibliotekanauki.pl/articles/1195604.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.20.fa
85.85.+j
85.35.-p
31.30.jh
06.20.Dk
81.05.ue
Opis:
The classical, electrodynamic definition of the ampere is incoherent with quantum electrodynamics. The problem, although insignificant at the macroscopic scale, manifests clearly at the nanostructure level, where the consistently quantum approach is necessary. In this paper, we consider the Casimir effect to quantify inconsistencies that could have resulted if electric metrology of microstructures and nanostructures (including graphene) had been based on classical electrodynamics and the current SI definition of the ampere. The issue is discussed in the context of the New SI program, where the base electric unit is to be redefined by fixing the numerical value of the elementary charge. The conclusion supports the case for a prompt redefinition of the base electric unit, which will make the electric metrology in general, and the electric metrology of nanostructures in particular, coherent with the international system of units.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 3-12
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total Acoustic Power of Two Concentric Clamped Circular Plates Vibrating in a Fluid
Autorzy:
Rdzanek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1402179.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.Bi
43.20.El
43.20.Fn
43.20.Rz
Opis:
This study focuses on the problem of sound radiation by two concentric clamped flat plates, circular and annular, into the half-space. The system of three coupled differential equations comprising two equations of motions of plates and the wave equation, is solved exactly. Vibrations of plates are axisymmetric and time-harmonic with a single excitation frequency. The initial phase difference of excitations can be nonzero. Attenuation due to fluid loading and material damping is included. Kirchoff-Love and Kelvin-Voigt theories are applied. The effect of initial phase difference of excitations on the acoustic power radiated is examined as well as errors resulting from neglecting the fluid loading.
Źródło:
Acta Physica Polonica A; 2015, 128, 1A; A-41-A-45
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Microwave Radiation for Subsurface Absolute Temperature Measurement
Autorzy:
Susek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1506860.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.63.Hg
44.40.+a
84.40.Dc
07.57.Hm
Opis:
Problems related to thermal radiation of human bodies in the microwave range are presented in the paper from medical diagnosis point of view. The paper reviews physical principles of thermal radiation measurement at microwave frequencies. A design of a modulation type radiometer with both zero reading and compensation of influence of the reflectivity is presented in the paper. On the base of this design, requirements for absolute temperature measurement conditions in the lossy and homogeneous medium were found. It is worth noting that these demands do not need any limitations for environmental parameters, especially for their stability during measurement (ambient temperature stability). At the end, experimental results of the measurements carried out with the use of the microwave radiometer operating in the 1.5 GHz band are shown.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1246-1249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunnel Magnetoresistance for Phonon-Assisted Tunneling through Quantum Dots
Autorzy:
Rudziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1813937.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Mk
73.63.Kv
73.23.Hk
Opis:
Spin-polarized transport through a single-level quantum dot interacting with a local phonon mode is studied in the frame of the nonequilibrium Green-function technique. It is shown that strong electron-phonon interaction gives rise to a significant current suppression, to additional resonance peaks in the differential conductance as well as to oscillations of the tunnel magnetoresistance. Also, a phonon-induced mechanism leading to a minimum in tunnel magnetoresistance at zero bias voltage is explained.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 587-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short Range Order in Polymers within Neutrons Eyeshot
Autorzy:
Zając, W.
Powiązania:
https://bibliotekanauki.pl/articles/1810274.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.41.+e
61.43.-j
61.05.fg
Opis:
The paper presents a short review of neutron scattering results obtained during investigation of short range order in bulk polymers. Neutron scattering proves exceptionally powerful in this type of study through (i) large penetration depth of bulk samples, (ii) isotope sensitivity, and (iii) the use of spin polarization technique. The examples provided deliver results that can hardly be obtained from e.g. X-ray diffraction.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 594-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heisenberg Model of a Ferromagnetic Monolayer Deposited on a Non-Magnetic Bulk Substrate
Autorzy:
Jaworski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1810418.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
75.10.Hk
75.10.Jm
Opis:
A model describing a Heisenberg ferromagnetic monolayer (in a magnetic field) interacting with its non-magnetic bulk substrate is formulated. We use reduced-density operators to show that physical properties of the monolayer are affected by its interaction with the environment. Particularly the influence of the substrate lattice vibrations on the monolayer exchange parameter is examined. The Gaussian-type orbitals were used to calculate the distance dependence of the exchange parameter and the many-body Green functions to calculate the temperature dependence of the magnetization. Finally, the influence of the Debye temperature of the substrate on the magnetization of the monolayer is depicted. Although the resultant effect is not prominent, we state that interaction of ultrathin magnetic films with their environment has to be taken into account in the construction of the reduced-density operator.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 171-173
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Flip Transitions in Tunneling through a Quantum Dot Coupled to Ferromagnetic Electrodes
Autorzy:
Rudziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1810526.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Mk
73.63.Kv
73.23.Hk
Opis:
Using nonequilibrium Green function formalism the spin-polarized electronic transport through a quantum dot coupled to ferromagnetic electrodes is studied. Arbitrary Coulomb correlations and spin-flip processes are considered in the dot, for both parallel and antiparallel magnetic configurations of the junction. It is found that spin-flip processes suppress the magnetoresistance between each pair of the threshold bias voltages, thus giving rise to sharp tunnel magnetoresistance maxima at the thresholds. The origin of additional steps in the electric current, splitting of the resonance peaks in the corresponding differential conductance as well as negative differential conductance is also discussed in the context of interplay between tunneling processes and the intradot spin-flip transitions.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 281-283
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Coupling of Magnetic Multilayers in Spin-Polarized Jellium
Autorzy:
Schmidt, W.
Powiązania:
https://bibliotekanauki.pl/articles/1955446.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
75.70.-i
Opis:
The bilinear and biquadratic coupling between two metallic layers separated by a nonmagnetic metal spacer are studied. The paper contains analytical formulae for the coupling which are obtained from the energy potential of the spin-polarized electron gas. The formulae for the coupling are obtained in the framework of the Hohenberg-Kohn formalism of the density functional theory and variables of the coupling are the electron density and the spin polarization of the magnetic multilayer.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 265-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Mechanism of Biquadratic Coupling in Magnetic Superlattices
Autorzy:
Gruhn, W.
Powiązania:
https://bibliotekanauki.pl/articles/1955468.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Cn
Opis:
Using the modified total energy approach of Bruno, we prove that for the transition metal or rare-earth superlattices the additional scattering of free electrons on magnetic ion multipole moment gives rise to ferroquadrupolar biquadratic coupling between magnetic layers. We show that in this novel, intrinsic mechanism, the anisotropy of the magnetoresistivity should manifest itself.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 303-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Wave Resonance in the FeBr$\text{}_{2}$ Metamagnetic Thin Film
Autorzy:
Rudziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/2013141.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.70.Ak
Opis:
The spin-wave resonance in the thin FeBr$\text{}_{2}$ field-induced metamagnet in the paramagnetic phase with the (001) surfaces and at low temperatures is examined theoretically. It is found that the absorption spectrum is strongly affected by modifications of the surface exchange parameters. Also, the conditions for the appearance of various surface and bulk spin-wave features are discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 503-506
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Translations for a Spatially Periodic Magnetic Field
Autorzy:
Florek, W.
Powiązania:
https://bibliotekanauki.pl/articles/2013243.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.-a
73.40.Hm
71.70.Di
71.10.-w
Opis:
It is shown that in the case of a free electron in a spatially periodic magnetic field the concept of magnetic translations operators is still valid and, moreover, these operators can be defined in the same way as for a Bloch electron in a uniform magnetic field. The results can be a useful tool in the investigation of recently observed phenomena in 2D electron gas with spatially modulated density.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 619-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1177

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