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Wyświetlanie 1-15 z 32
Tytuł:
Transport Properties of Rippled Graphene
Autorzy:
Zwierzycki, M.
Powiązania:
https://bibliotekanauki.pl/articles/1428651.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.ue
72.10.Fk
72.80.Vp
Opis:
It is common to describe graphene as ideally flat plane, however there exists both theoretical and experimental evidence that it is most usual to find it in a rippled state. The ripples can be either induced by the substrate or formed spontaneously in suspended graphene. The lateral size of such features ranges between several and tens of nanometers with the height of up to 1 nm. It has been suggested that the presence of ripples could be one of the factors ultimately limiting mobility of carriers and that it may be also responsible, by introducing an effective gauge field, for the lack of weak localization observed in certain graphene samples. In the present contribution the transport properties of the rippled graphene are studied theoretically starting with the simple case of one-dimensional modulation. Using either single-band or the full $sp^3$ tight-binding Hamiltonians we compare and discuss the importance of two ripple-related mechanisms of scattering: the variation of interatomic distances and hybridization between π and σ bands of graphene.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1246-1249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conduction Mechanism of 4-Aminoantipyrine as a New Organic Semiconductor
Autorzy:
Yahia, I.
Powiązania:
https://bibliotekanauki.pl/articles/1198658.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Me
78.40.Fy
72.10.Fk
77.84.Bw
Opis:
X-ray diffraction pattern of 4-aminoantipyrine was studied and it is a single phase with a polycrystalline structure. 4-aminoantipyrine has hexagonal structure with space group P6/mcc. The electrical properties of 4-aminoantipyrine were studied in the temperature range (303-373 K) below the melting point of the studied compound and in the frequency range (100 Hz-100 kHz). The obtained results of dc conductivity showed a positive temperature coefficient at the lower temperatures and a negative temperature coefficient at the higher temperatures. The ac conductivity obeys the power law. Ac conductivity can be reasonably interpreted in terms of overlapping-large polaron tunneling model and the correlated barrier hopping model. 4-aminoantipyrine is a good candidate for electronic device due to its electrical conductivity and capacitance.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1167-1171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impurity Self-Screening
Autorzy:
Wilamowski, Z.
Przybylińska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1929774.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.-d
72.10.Fk
Opis:
In a mixed valence impurity system the distribution of impurity charges can be adjusted to minimize the Coulomb energy of inter-impurity interactions. In this paper we discuss the possibility of extending the methods of analytical evaluation of the pair correlation function for classical liquids to apply to a system with a built-in disorder, where the occupation probability is governed by the Fermi-Dirac statistics.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 832-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Magnetic Equation of State and Transport Properties in Reduced Dimensions
Autorzy:
Warda, K.
Wojtczak, L.
Powiązania:
https://bibliotekanauki.pl/articles/1032847.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.30.Jk
64.60.-i
75.70.Cn
72.10.Fk
Opis:
Basing our considerations on magnetic equation of state applied to the description of magnetic systems of confined geometry we developed the model of calculations of the electrical resistivity for metallic multilayers. It was shown that in the transport of charge in ferromagnetic material d-electrons play an important role. The key parameters in the presented model are: the width of the electron energy band and the shift of the energy level for two spin orientations as well as the Fermi energy and size of the sample (the thickness of magnetic and nonmagnetic layers and the total number of layers). The presented results of calculations for temperature dependence of magnetoresistance are in qualitative agreement with the available experimental data. The model calculations introduced in this paper can be applied to current-in-plane geometry as well as to current-perpendicular-to-plane geometry. The calculations are valid within the limitations of the resistor network model.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 878-880
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Disorder on Spin and Charge Excitations in the Fractional Quantum Hall Effect
Autorzy:
Výborný, K.
Müller, Ch.
Dethlefsen, A. F.
Haug, R. J.
Wójs, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047400.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.-f
75.10.Jm
72.10.Fk
73.63.-b
Opis:
A simple model of disorder in fractional quantum Hall systems is combined with the standard exact diagonalisation technique. Electron-density-dependent gaps at filling factors 1/3,2/3,2/5, and 3/5 measured by activated transport can then be fitted with a single reasonable value of d which has the meaning of the separation of ionized donors from the quasi-2D electron gas.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 249-254
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Dependent Transport through Metallic System with Magnetic Impurities
Autorzy:
Spisak, B.
Wołoszyn, M.
Paja, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810518.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.25.Ba
73.63.Nm
Opis:
The problem of spin-dependent transport of electrons through a metallic nanostructure is considered. The system consists of non-magnetic metal wire with two magnetic impurities and is connected to two ferromagnetic leads. The differential conductance is calculated by using the transfer matrix method. The spin polarization of the conductance is also obtained. It was found that this polarization is dependent on the spin configuration of magnetic impurities. This dependence can be controlled by the applied bias voltage.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 266-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Scattering and the Band Structure of Mixed Crystals Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se
Autorzy:
Skierbiszewski, C.
Wilamowski, Z.
Suski, T.
Kossut, J.
Witkowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1923803.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.20.Fr
72.80.Jc
Opis:
In this paper the dependence of the band structure and the electron scattering mechanisms on the molar fraction x are studied in Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se. The crossover from the zero-gap band to the open band-gap configuration at x ≈ 0.08 is predicted. We explain the drop of the electron mobility for x > 0.002 by the alloy scattering mechanism.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 809-812
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Study of Charged Donor Ordering in HgSe Doped with Iron and Gallium
Autorzy:
Skierbiszewski, C.
Suski, T.
Kossut, J.
Wilamowski, Z.
Dobrowolski, W.
Witkowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1891020.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.20.Fr
72.80.Jc
Opis:
Transport experiments (Hall effect and conductivity) under hydrostatic pressure up to 1 GPa at liquid helium temperatures on HgSe: Fe, Ga (N$\text{}_{Fe}$ = 2 x 10$\text{}^{19}$ cm$\text{}^{-3}$; 0 ≤ N$\text{}_{Ga}$ ≤ 10$\text{}^{19}$ cm$\text{}^{-3}$) were performed. The results show that the gallium co-doping of HgSe:Fe decreases the degree of spatial correlations between charged impurities. Under the hydrostatic pressure, used as a tool for changing the ratio of the charged to neutral impurities, this effect is even more pronounced. A qualitative agreement between the calculation within the short-range correlation model and our experimental data is achieved.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 401-404
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anderson Localization of Electromagnetic Waves in Dielectric Media: Model Studies
Autorzy:
Rusek, M.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2044616.pdf
Data publikacji:
2006-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Fx
42.25.Hz
72.10.Fk
78.20.Ci
Opis:
Anderson localization of electromagnetic waves in random arrays of dielectric cylinders confined within a planar metallic waveguide is studied. The disordered dielectric medium is modeled by a system of randomly distributed 2D electric dipoles. An effective theoretical approach based on the method of images is developed. A clear distinction between isolated localized waves (which exist in finite media) and the band of localized waves (which appears only in the limit of the infinite medium) is presented. The Anderson transition emerging in the limit of an infinite medium is observed both in finite size scaling analysis of transmission and in the properties of the spectra of some random matrices. The sound physical interpretation of the obtained results suggests deeper insight into the existing experimental and theoretical work.
Źródło:
Acta Physica Polonica A; 2006, 109, 1; 109-119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Localization in Left-Handed Media
Autorzy:
Rusek, M.
Orłowski, A.
Mostowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047827.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Nk
41.20.Jb
72.10.Fk
72.15.Rn
Opis:
Localized waves in disordered left-handed materials are studied using a generalized coupled-dipole model. Resonances in an open system consisting of randomly distributed electric and magnetic dipoles are investigated. A new type of long-lived resonance modes localized at the boundary of the system is found. They resemble evanescent waves responsible for a superfocusing phenomenon by a left-handed lens.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 673-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertex Corrections to the Electrical Conductivity of the Disordered Falicov-Kimball Model
Autorzy:
Pokorný, V.
Janiš, V.
Powiązania:
https://bibliotekanauki.pl/articles/1534607.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.28.+d
72.10.Fk
Opis:
Quantum coherence of elastically scattered lattice fermions is studied. We calculate vertex corrections to the electrical conductivity of electrons scattered either on thermally equilibrated or statically distributed random impurities and we demonstrate that the sign of the vertex corrections to the Drude conductivity is in both cases negative.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 922-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Relaxation Time of Spin-Polarized Electrons
Autorzy:
Paja, A.
Spisak, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/2038184.pdf
Data publikacji:
2004-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
72.10.Fk
72.15.Lh
72.25.Ba
72.25.Rb
Opis:
We study the mechanism of spin relaxation in 3D disordered metallic systems due to the spin-orbit scattering on charged impurities. The transport relaxation time for spin-polarized conduction electrons is calculated analytically in the presented model, where the screened Coulomb potential is used for the description of impurities.
Źródło:
Acta Physica Polonica A; 2004, 106, 1; 69-76
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signatures of Transverse Magnetic Anisotropy in Transport through a Large-Spin Molecule in the Kondo Regime
Autorzy:
Misiorny, M.
Weymann, I.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402574.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.25.-b
73.23.-b
75.50.Xx
Opis:
The effect of transverse magnetic anisotropy on spin-dependent transport through a large-spin molecule strongly tunnel-coupled to ferromagnetic electrodes is analyzed theoretically. In particular, we investigate whether it is possible to observe in transport signatures of oscillations of the ground-state doublet splitting due to the application of an external magnetic field along the molecule's hard axis. We show that magnetic field leads to revivals of the Kondo effect, with the Kondo temperature depending on the magnetic configuration of the device.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 200-203
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin and Charge Transport in a Magnetic Tunnel Junction with Magnetic Impurities Embedded in the Tunnel Barrier
Autorzy:
Misiorny, M.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402573.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
72.25.-b
73.23.-b
75.50.Xx
Opis:
Electronic transport in a nanoscopic magnetic tunnel junction with magnetic particles or magnetic impurity atoms/molecules embedded in the barrier is studied theoretically. The impurity Hamiltonian includes magnetic anisotropy of easy axis type with additional perpendicular term. The description takes into account both elastic tunneling processes as well as inelastic processes associated with a flip of electron spin.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 196-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interplay of Quantum Size Effect and Surface Electron Scattering in Conductivity of Thin Films
Autorzy:
Makarov, N. M.
Moroz, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/1964813.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Bk
72.10.Fk
Opis:
We constructed the most general theory of the classical and quantum static electron transport for 3D films with randomly rough boundaries. The electron-surface interaction was included via approximation with mildly sloping asperities, when the rms height ξ of boundary defects is less than their mean length L. Then we analyzed influence of spatial quantization and electron-surface scattering on the film conductivity ⟨σ⟩ and their interference. Joint action of those factors leads to peculiarities (sharp dips) of ⟨σ⟩ versus the sample thickness d appearing at points where a new conducting electron channel opens. The dips have fundamental quantum origin and are caused by size quantization of electron-surface scattering rate. When studying ⟨σ⟩ versus the bulk mean free path l of electrons, we revealed that, as bulk collisions vanish (l → ∞), the quantum conductivity approaches finite residual value associated with electron-surface interaction. The residual conductivity was first shown to possess either quantum or exclusively classical origin depending on d, l, and the electron wavelength. On the basis of the investigations provided, the relation between quantum and classical effects in the film conductivity was clarified. The theoretical results were successfully tested against recent experimental data concerning the conductivity of ultrathin films.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 457-460
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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