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Wyświetlanie 1-15 z 65
Tytuł:
Electron Transport Properties of UAsSe
Autorzy:
Henkie, Z.
Fabrowski, R.
Wojakowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929841.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.-v
72.15.Qm
75.50.Cc
Opis:
Anisotropy of resistivity (2-450 K), in-plane thermoelectric power (4-300 K) and Hall's constants (200-450 K) for UAsSe were determined. It is highly anisotropic, uniaxial ferromagnet below T$\text{}_{C}$ = 113 K. The compound is classified as Kondo lattice system becoming noncoherent below ≈ 0.5T$\text{}_{C}$.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 249-252
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical Electron Transport in GaN/AlGaN Heterostructures
Autorzy:
Reklaitis, A.
Powiązania:
https://bibliotekanauki.pl/articles/1178371.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Kp
72.20.-i
72.30.+q
Opis:
Nonequilibrium dc and large-signal ac vertical electron transport in GaN/AlGaN heterostructures is investigated by Monte Carlo simulations. The symmetric two-barrier GaN/AlGaN heterostructures are studied. The results of simulations show that polarization charges have a profound effect on dc and large-signal ac characteristics of vertical electron transport in GaN/AlGaN heterostructures. Under certain composition, geometry and doping profile, the GaN/AlGaN heterostructures may become bipolar, i.e., the inversion layers may originate at heterointerfaces due to strong built-in electric fields, which are induced by polarization charges.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 261-266
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport in Submicron Wires of Semiconductors
Autorzy:
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1947015.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
73.20.Fz
73.61.Ga
75.50.Pp
Opis:
We review the methods of fabrication and transport properties of submicron II-VI, IV-VI and III-V semiconductor wires. Devices were prepared by electron-beam lithography and used for detailed magnetotransport studies, carried out at low (down to 30 mK) temperatures. We discuss a number of novel features obtained in ballistic, diffusive and localized transport regimes. In particular, we describe the universal conductance fluctuations for semimagnetic materials (CdMnTe) and discuss the edge channel transport for PbTe, PbSe and GaAs/GaAlAs systems.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 691-701
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport in Magnetic Quantum Point Contacts
Autorzy:
Pietsch, T.
Egle, S.
Espy, C.
Strigl, F.
Scheer, E.
Powiązania:
https://bibliotekanauki.pl/articles/1490057.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
72.25.-b
73.63.-b
Opis:
In recent years, the fabrication of novel building blocks for quantum computation- and spintronics devices gained significant attention. The ultimate goal in terms of miniaturization is the creation of single-atom functional elements. Practically, quantum point contacts are frequently used as model systems to study the fundamental electronic transport properties of such mesoscopic systems. A quantum point contact is characterised by a narrow constriction coupling two larger electron reservoirs. In the absence of a magnetic field, the conductance of these quantum point contacts is quantised in multiples of $2 e^2//h$, the so-called conductance quantum $(G_0)$. However, in the presence of magnetic fields the increased spin-degeneracy often gives rise to a deviation from the idealized behaviour and therefore leads to a change in the characteristic conductance of the quantum point contact. Herein, we illustrate the complex magnetotransport characteristics in quantum point contacts and magnetic heterojunctions. The theoretical framework and experimental concepts are discussed briefly together with the experimental results as well as potential applications.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 401-409
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical Electron Transport through PbS-EuS Structures
Autorzy:
Wrotek, S.
Dybko, K.
Morawski, A.
Mąkosa, A.
Wosiński, T.
Figielski, T.
Tkaczyk, Z.
Łusakowska, E.
Story, T.
Sipatov, A. Yu.
Szczerbakow, A.
Grasza, K.
Wróbel, J.
Palosz, W.
Powiązania:
https://bibliotekanauki.pl/articles/2036032.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Ck
75.30.Et
Opis:
Temperature dependence of current-voltage I-V characteristics and resistivity is studied in ferromagnetic PbS-EuS semiconductor tunnel structures grown on n-PbS (100) substrates. For the structures with a single (2-4 nm thick) ferromagnetic EuS electron barrier we observe strongly non-linear I-V characteristics with an effective tunneling barrier height of 0.3-0.7 eV. The experimentally observed non-monotonic temperature dependence of the (normal to the plane of the structure) electrical resistance of these structures is discussed in terms of the electron tunneling mechanism taking into account the temperature dependent shift of the band offsets at the EuS-PbS heterointerface as well as the exchange splitting of the electronic states at the bottom of the conduction band of EuS.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 629-635
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring photosynthetic electron transport during stress responses in Arabidopsis
Autorzy:
Shapiguzov, A.
Cui, F.
Overmyer, K.
Kangasjarvi, J.
Powiązania:
https://bibliotekanauki.pl/articles/80094.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
monitoring
plant cell
chloroplast
reactive oxygen species
signal receptor
immune response
electron transfer chain
plant stress
Arabidopsis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron-Electron Scattering Influence on Hot Electron Transport in Semiconductors
Autorzy:
Dedulewicz, S.
Kancleris, Ž.
Powiązania:
https://bibliotekanauki.pl/articles/1890875.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
Opis:
Electron-electron scattering has been shown to manifest itself when scattering by optical phonons is of importance. The strongest influence has been observed in the slightly heated electron system at the lattice temperature T ≈ T$\text{}_{0}$/5 (T$\text{}_{0}$ being the characteristic temperature of optical phonon).
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 353-356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Simulations of Electron Transport through a Nanowire Quantum Dot
Autorzy:
Łapa, D.
Sowa, A.
Adamowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811952.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Nm
Opis:
Electron tunneling through a quantum dot embedded in a nanowire was studied by the transfer matrix method. A smoothness of the interfaces was taken into account using the analytical parametrization of the potential profile. We calculated the current-voltage characteristics and discussed the effect of the spacer, which separates the quantum dot from the contacts. We found that the tunneling current peak possesses the asymmetric Fano resonance shape in the absence of spacer. The results of calculations agree with the experimental data.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1213-1218
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport through Double Quantum Dots with Interdot Coulomb Repulsion
Autorzy:
Sztenkiel, D.
Świrkowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/2047016.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
73.21.La
73.23.Hk
Opis:
Electron transport through a system of two quantum dots connected in series is studied theoretically with the use of non-equilibrium Green function formalism based on the equation of motion method. Each dot is described by the one-level Anderson Hamiltonian and interdot Coulomb interactions in the form of the Hubbard-like term are taken into account. The electric current and occupation numbers are calculated with the use of two different approaches. The results of the methods are compared and discussed in detail. Strong asymmetry of I-V characteristics with respect to bias voltage reversal are obtained when energy levels of the dots are not aligned.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 389-394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot-Electron Transport and Microwave Noise in 4H-SiC
Autorzy:
Ardaravičius, L.
Liberis, J.
Kiprijanovič, O.
Matulionienė, I.
Matulionis, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041761.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
72.70.+m
73.40.Kp
Opis:
Hot-electron transport and microwave noise are investigated for n-type 4H-SiC (n=2×10$\text{}^{17}$ cm$\text{}^{-3}$) subjected to a pulsed electric field applied parallel to the basal plane. At room temperature, the negative differential conductance, masked by field ionization at the highest fields, is observed in the field range between 280 and 350 kV/cm. The threshold fields for the negative differential conductance and field ionization increase with lattice temperature. The results on microwave noise are used to evaluate the effective hot-electron temperature and the hot-electron energy relaxation time.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 310-314
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport and Spin Scattering in Very Thin Disordered Metallic Films
Autorzy:
Paja, A.
Spisak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1814037.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Cz
72.25.Ba
73.50.-h
73.63.-b
Opis:
We consider the electron transport through a very thin disordered metallic film doped with magnetic impurities. We treat the film as a quasi-two-Łinebreak -dimensional system with structural disorder where some ions have spins and other are spinless. The interaction of conduction electrons with localized spins is described by means of the exchange term of the Hamiltonian. The scattering is treated in the first Born approximation and the potential is assumed to be the Coulomb screened one. The total effective cross-section is calculated as a sum of the part responsible for the potential scattering and the second part which comes from the spin-spin scattering. The Fermi sphere splits into separate sheets due to the finite size of the system in the z direction, therefore, the cross-section and the relaxation time are calculated for each sheet independently. The total transport relaxation time and the conductivity are obtained as functions of the thickness of the system and the contents of magnetic impurities. Some model calculations have been made for a thin disordered film of copper doped with manganese.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1289-1295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Electron-Transport Properties of Photoresist Implanted by $Sb^{+}$ Ions
Autorzy:
Vabishchevich, N.
Brinkevich, D.
Volobuev, V.
Lukashevich, M.
Prosolovich, V.
Sidorenko, Yu.
Odzhaev, V.
Partyka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1503884.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.40.Hp
Opis:
Morphology and electron-transport properties in the photoresist-silicon structures implanted by 60 keV antimony in the fluence range 1 × $10^{15}$ ÷ 5 × $10^{16} cm^{-2}$ with the ion current density 4 μA/$cm^2$ have been investigated. Microhardness increases with the increasing fluence. Non-monotonous dependence of microhardness on the depth in the implanted structures was observed. Transition from insulating to the metallic regime of conductivity was not observed.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 46-48
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on fast electron transport in the context of fast ignition
Autorzy:
Batani, D.
Powiązania:
https://bibliotekanauki.pl/articles/146597.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
inertial confinement fusion (ICF)
fast ignition (FI)
fast electrons
ultra-high-intensity lasers
relativistic laser-plasma interaction
Opis:
This paper deals with the problem of fast electron propagation in plasmas, in the context of the fast ignition (FI) approach to inertial confinement fusion (ICF). In FI, a short-pulse high-intensity laser beam should generate a beam of relativistic electrons, which propagate into the compressed pellet, depositing energy and igniting the fuel. The study of electron propagation in dense matter is hence essential to the success of this scheme. The propagation of relativistic electrons in dense matter is determined by collisions of fast electrons with ions and electrons in the material, which can be described in terms of stopping power, but it also depends on self-generated magnetic and electric fields, which play a major, or even dominant role. In this paper we will show the importance of such collective effects by discussing several experimental examples.
Źródło:
Nukleonika; 2011, 56, 2; 99-106
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport and Point Contact Spectroscopy of Cubic DyCu$\text{}_{5}$
Autorzy:
Nenkov, K.
Idzikowski, B.
Ilkovic, S.
Kačmarčiková, E.
Reiffers, M.
Müller, K.
Powiązania:
https://bibliotekanauki.pl/articles/2013688.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
72.15.Eb
73.23.Ad
73.40.Jn
Opis:
The electron transport properties and point contact spectra of melt-spun DyCu$\text{}_{5}$ with the cubic phase (structure type AuBe$\text{}_{5}$, space group $F\overline{4}3m$) were investigated. It was found by ac-susceptibility measurements that below a transition temperature T$\text{}_{m}$=6.5 K this phase shows metamagnetism. Between T$\text{}_{m}$ and T$\text{}_{C}$=14.5 K a spontaneous magnetization is found. Our measurements of electrical resistivity confirm the existence of two magnetic phase transitions in the compound. Furthermore, we present point contact spectra of DyCu$\text{}_{5}$-Cu heterocontacts which are directly proportional to the electron-quasiparticle interaction function. Apart from a peak at about 18 meV, which is characteristic of electron-phonon interaction in pure Cu, we observed a series of additional maxima at lower energy, which are connected with the allowed 4f-transitions from the ground state to excited crystalline electric field levels.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 843-846
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 65

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