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Wyświetlanie 1-15 z 28
Tytuł:
Mobility Spectrum Analysis of the Electrical Conduction
Autorzy:
Dziuba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1891991.pdf
Data publikacji:
1991-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
72.20.My
72.80.Ey
Opis:
The electrical conductivity tensor components σ$\text{}_{xx}$(H) and σ$\text{}_{xy}$(H) have been transformed into mobility spectrum. The resolution of the mobility spectrum has been discussed. As an example the electrical conduction in HgTe and HgCdTe samples have been analyzed using resistivity tensor components, conductivity tensor components and using the mobility spectrum.
Źródło:
Acta Physica Polonica A; 1991, 80, 6; 827-839
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Organic Semiconductor BTQBT with High Conductivity and High Mobility
Autorzy:
Inokuchi, H.
Imaeda, K.
Powiązania:
https://bibliotekanauki.pl/articles/1943958.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
72.20.-i
Opis:
We have found a novel organic semiconductor, BTQBT, with a high electrical conductivity of about 10$\text{}^{-3}$ S cm$\text{}^{-1}$ and a high Hall mobility of about 3 cm$\text{}^{2}$ V$\text{}^{-1}$s$\text{}^{-1}$ at room temperature. We have also succeeded in measuring the temperature dependence of the Hall mobility. It varies with temperature as Τ$\text{}^{-1.6}$, which agrees with the theoretical Τ$\text{}^{-1.5}$ dependence for the mobility determined by lattice scattering. The characteristic transport property of BTQBT results from strong intermolecular interactions in the crystal, which is convinced by the energy dispersion with a bandwidth of about 0.5 eV from the theoretical and experimental band structures.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1161-1170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Negative Mobility of Single Domain Wall in Magnetic Microwires
Autorzy:
Varga, R.
Richter, K.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1506994.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
Here, we present the domain wall dynamics in thin magnetic wires that exhibit even negative mobility regime. Such a regime is well below the Walker limit and is a result of structural relaxation. It disappears at high frequencies and it can be enhanced by application of mechanical stress. Moreover, the domain wall velocity was found to be almost field-independent at certain measuring conditions. Anyway, the domain wall velocity remains quite high (> 450 m/s) in this regime.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 747-748
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hall Mobility Field Effect in Two Layer Conductivity Samples
Autorzy:
Mekys, A.
Storasta, J.
Zindulis, A.
Smilga, A.
Balakauskas, S.
Powiązania:
https://bibliotekanauki.pl/articles/1812055.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.37.+q
Opis:
Classical Hall mobility experimental setup was applied for samples with parallel plane (sandwich) variable conductivity layers. The measured effective Hall mobility strongly depends on applied electric field and does not characterise the real carrier mobility. Numerical modelling explains the effect as a consequence of electric field redistribution and lowering at Hall contacts. Measurement of carrier mobility in such structures is suggested.
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 903-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impurity-Scattering Limited Electron Mobility in Free Standing Quantum Wires: Image Charge Effect
Autorzy:
Vagner, P.
Mos̆ko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1952718.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
73.50.Bk
Opis:
We calculate the impurity-scattering limited mobility of the one-dimensional electron gas in a rectangular GaAs quantum wire confined in the vertical (growth) direction by n-modulation doped AlGaAs layers and free standing along the transverse direction. The scattering potential of the ionized impurity is obtained by solving the Poisson equation with z-dependent electrostatic permittivity in order to take into account the image charge effect due to the abrupt permittivity change at the GaAs/air interfaces. We show that the "image impurity" scattering tends to drastically reduce the electron mobility for sufficiently small (≈10 nm) transverse wire widths.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 1103-1107
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Mobility 2D Electron Gas in CdTe/CdMgTe Heterostructures
Autorzy:
Karczewski, G.
Jaroszyński, J.
Kutrowski, M.
Barcz, A.
Wojtowicz, T.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968126.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Hm
Opis:
We report on iodine doping of molecular beam epitaxy (MBE)-grown Cd(Mn)Te quasi-bulk films and modulation-doped CdTe/Cd$\text{}_{1-y}$Mg$\text{}_{y}$Te two-dimensional (2D) single quantum well structures. Modulation doping with iodine of CdTe/Cd$\text{}_{1-y}$Mg$\text{}_{y}$Te structures resulted in fabrication of a 2D electron gas with mobility exceeding 10$\text{}^{5}$ cm$\text{}^{2}$/(V s). This is the highest mobility reported in wide-gap II-VI materials.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 829-832
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Many-Body Localization for Randomly Interacting Bosons
Autorzy:
Sierant, P.
Delande, D.
Zakrzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033315.pdf
Data publikacji:
2017-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
many-body localization
Bose-Hubbard model
disorder in many-body physics
mobility edge
Opis:
We study many-body localization in a one dimensional optical lattice filled with bosons. The interaction between bosons is assumed to be random, which can be realized for atoms close to a microchip exposed to a spatially fluctuating magnetic field. Close to a Feshbach resonance, such controlled fluctuations can be transfered to the interaction strength. We show that the system reveals an inverted mobility edge, with mobile particles at the lower edge of the spectrum. A statistical analysis of level spacings allows us to characterize the transition between localized and excited states. The existence of the mobility edge is confirmed in large systems, by time dependent numerical simulations using tDMRG. A simple analytical model predicts the long time behavior of the system.
Źródło:
Acta Physica Polonica A; 2017, 132, 6; 1707-1712
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Discrete Dislocation Dynamics: Influence of Segment Mobility on Critical Shear Stress
Autorzy:
Záležák, T.
Dlouhý, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402114.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
61.72.Lk
62.20.Hg
Opis:
We use 3D discrete dislocation dynamics technique to study a low-angle tilt boundary migration subjected to applied shear stress at high temperatures, where diffusion significantly contributes to the dislocation motion. The model considers Peach-Koehler forces due to interactions between individual straight dislocation segments. The model also addresses dislocation plasticity in a field of impenetrable incoherent spherical precipitates. Velocities of the individual dislocation segments are calculated in relation to the crystallography of the material. Several calculation series have been carried out for different velocity and driving force relations. The results show that there exists a critical applied shear stress, below which the low angle dislocation boundary cannot surpass the rigid precipitates and remains in an equilibrium configuration. This agrees with experimental results obtained in creep tests of dispersion strengthened alloys. The critical stresses have been calculated also for situations where the applied stress was decreased during the interaction between the low-angle tilt boundary and the precipitates.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 654-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobility of Hematite Submicron Particles in Water Solutions of Sugar
Autorzy:
Fornal, P.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811893.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.40.Jc
47.57.ef
47.57.J-
47.61.Cb
Opis:
The mobility of the 100 nm $Fe_2O_3$ particles in dense water solutions of sugar (sucrose) was determined from the analysis of the resonance absorption line shape of the Mössbauer spectra recorded in the -5°C to 40°C temperature range for different sugar concentrations. The discrepancy between the experimental data and the prediction of the classical theory of Brownian movement are interpreted in the term of the short observation time and the interaction between the solid particles in fluids, which extends in water up to 300 nm. The sedimentation process in the studied colloids was observed.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1667-1673
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobility of Ferroelectric Domains in Antimony Sulfoiodide
Autorzy:
Toroń, B.
Nowak, M.
Kępińska, M.
Szperlich, P.
Powiązania:
https://bibliotekanauki.pl/articles/1376000.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
77.80.Dj
77.80.B-
81.05.Hd
Opis:
Different optical energy gaps in ferroelectric and paraelectric phases as well as light scattering on domain walls allow to observe ferroelectric domains in antimony sulfoiodide (SbSI) near the Curie temperature. Mobility 8.11(44)× $10^{-8}$ $m^2$/(Vs) of ferroelectric domain walls under external electric field has been determined along c-axis of SbSI single crystals using optical transmittance microscopy.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1093-1095
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Generation and Detection by Plasma Waves in Nanometer Gate High Electron Mobility Transistors
Autorzy:
Knap, W.
Łusakowski, J.
Teppe, F.
Dyakonova, N.
Meziani, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2041635.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.-b
73.23.-b
Opis:
The high electron mobility transistors can act as a resonator cavity for the plasma waves that can reach THz frequencies for a nanometer size devices. As was predicted by Dyakonov and Shur in 1993, the steady state of the current flow in a gated 2D electron gas can become unstable leading to the emission of an electromagnetic radiation at the plasma wave frequencies. The theory predicted also that the plasma waves can be used for resonant detection of THz electromagnetic radiation. In the present paper we review our recent experiments on THz emission and detection performed on high electron mobility transistors based on different semiconductor structures: InGaAs/GaAlAs, GaAs/GaAlAs, and Si.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 82-91
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Magnetic Resonance Investigation of the Influence of Drawing and Drawing Temperatureon Molecular Mobility in iPP Fibres
Autorzy:
Mucha, L'.
Ševčovič, L.
Powiązania:
https://bibliotekanauki.pl/articles/1535491.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.Es
82.35.Lr
82.56.Nc
Opis:
A set of stretched isotactic polypropylene fibres prepared with the draw ratio λ = 2.5 at different temperatures was investigated by $\text{}^1H$ pulsed relaxation NMR method and continuous wave spectroscopy. Both, drawing and temperature of drawing influence physical properties of isotactic polypropylene fibres. NMR technique is shown to be advantageous for the study of these changes on molecular level since the shape of broad-line NMR spectra and processes of the NMR relaxation depend on the spatial configuration and motions of the resonating nuclei.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1057-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoplasmons in a High Electron Mobility GaAs/AlGaAs Heterostructure
Autorzy:
Białek, M.
Karpierz, K.
Piętka, B.
Grynberg, M.
Łusakowski, J.
Czapkiewicz, M.
Fronc, K.
Wróbel, J.
Umansky, V.
Powiązania:
https://bibliotekanauki.pl/articles/1409613.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Mf
Opis:
We have observed a multimode spectrum of magnetoplasmons in the Hall bars processed on a high electron mobility GaAs/AlGaAs heterostructure. We have found that the dispersion relation of these excitation follows square root dependence. Calculated wavelength of the fundamental magnetoplasmon mode fits to the width of sample.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1096-1098
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-Resolved Microwave Spectroscopy of High Electron Mobility GaAs/AlGaAs Structures
Autorzy:
Khachepuridze, A.
Ivanov, V. Yu.
Godlewski, M.
Regiński, K.
Bugajski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1991552.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
76.40.+b
76.70.Hb
Opis:
Mechanism of the optical detection of cyclotron resonance via emission from 2D electron gas in modulation doped quantum wells and in high electron mobility structures of GaAs/AlGaAs is discussed based on the results of time-resolved optical detection of cyclotron resonance. An important role of impact ionization processes is demonstrated. We also show that microwave radiation destroys emission enhancement at the Fermi level and the relevant mechanism is proposed.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 387-391
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Track Effects in Positronium Formation
Autorzy:
Stepanov, S.
Byakov, V.
Duplâtre, G.
Stepanov, P.
Bokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030026.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
positron
positronium
annihilation
ion-electron recombination
solvation
mobility
external electric field
track effects
polar and nonpolar liquids
Opis:
We discuss some aspects important for interpretation of the Ps formation process in liquids and molecular media: (1) inhomogeneity of intratrack reactions and parameters of the e⁺ track, (2) final states of e⁺, its solvation in polar and nonpolar liquids, relation to e⁺ mobility, (3) quasi-neutrality of the e⁺ blob and its ambipolar outdiffusion, (4) appearance of the "in-blob" and "out-of-the-blob" positron fractions, and (5) electric field effect on Ps formation.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1461-1465
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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