Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Wojciechowski" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 40
Tytuł:
Dynamical Mean Field within Iterative Perturbation Theory
Autorzy:
Radzimirski, B.
Wojciechowski, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/2047338.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.-w
71.10.Fd
Opis:
We consider the iterative-perturbation theory and its generalization to multi-orbital Hubbard models. We discuss in detail all aspects of numerical implementations of the method.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 753-761
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Josephson Effect in Graphene-Based Junctions
Autorzy:
Wojciechowski, R.
Kowalewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030444.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.45.+c
74.50.+r
72.80.Vp
Opis:
We study the Josephson effect in graphene based junctions where superconductivity in graphene is induced by the proximity effect from external substrate materials. The electronic properties of the junction is described by the Dirac-Bogoliubov-de-Gennes equations. We consider the junction consisting of two superconductors with different pairing potentials. Using appropriate boundary conditions imposed on the normal region-superconductors interfaces, we calculated the Andreev bound state energy, in the ballistic limit, taking into account two types of reflections namely the retro and specular Andreev reflections.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 632-634
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Function of Simple Metals: Relation between Theory and Experiment
Autorzy:
Wojciechowski, K. F.
Bogdanów, H.
Powiązania:
https://bibliotekanauki.pl/articles/1931342.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.30.1y
73.20.-r
Opis:
A variational calculation of the face-dependent work function with pseudopotential corrections employed has been performed. Critical analysis of the comparison between the calculated work function values and the experimental polycrystalline data is also given. The polycrystalline work function data may be treated as the mean low-index work function values and compared with the ones calculated. The use of the simple variational method and the Ashcroft pseudopotential for the description of metallic ions leads to good agreement between theory and experiment, and also enables to explain the increasing or decreasing tendency of work function values in different series of the simple metals.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 875-890
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budd-Vannimenus Theorem and Work Function Expression for a Metal-Metallic Adlayer System
Autorzy:
Peisert, J.
Wojciechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1931367.pdf
Data publikacji:
1994-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.+x
73.40.Jn
Opis:
The generalization of the Budd-Vannimenus theorem for jellium model of metal surface, when the positive background is described by a non-negative function, is given. Using the displacement electron density profile method and the generalized Budd-Vannimenus theorem it is shown that work function expressions given on the basis of Koopmans theorem and by Monnier et al. are equivalent both for a clean metal and for a metal covered by a metallic adlayer.
Źródło:
Acta Physica Polonica A; 1994, 85, 6; 979-983
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance Tunneling in Ferromagnet-Triplet Superconductors Junctions
Autorzy:
Kowalewski, L.
Wojciechowski, R. J.
Wojtuś, P.
Powiązania:
https://bibliotekanauki.pl/articles/2047330.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Pq
73.40.-c
74.45.+c
Opis:
We discuss the tunneling conductance in a ferromagnet-insulator-triplet superconductor junction. We consider the superconducting order parameters with spin triplet pairing having nodes. The nodal structure of the order parameter has been recently confirmed experimentally in Sr$\text{}_{2}$RuO$\text{}_{4}$. In particular, we study how a mid-gap structure of the tunnelling conductance depends on the phase difference of the pairing potential as well as on the orientation of the interface.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 683-691
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunneling Charge Transport in Graphene-Based Superconductor Junctions
Autorzy:
Wojciechowski, R.
Kowalewski, L.
Nogala, M.
Powiązania:
https://bibliotekanauki.pl/articles/1427098.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.45.+c
72.80.Vp
72.25.-b
Opis:
We study the spin polarized electron and hole tunneling transport through a graphene-based ferromagnet$(GF_1)$-insulator$(GI_1)$-superconductor$(G_{S})$-insulator$(GI_2)$-ferromagnet$(GF_2)$ junction. Proximity induced spin polarization and superconductivity in a graphene sheet are assumed to be created by superconducting and ferromagnetic electrodes placed on the top of the graphene. Using a four-dimensional version of the Dirac-Bogoliubov-de Gennes equation with appropriate boundary conditions we investigate the tunneling processes through the junctions. In particular, we present calculations of the amplitudes of normal and Andreev reflections as a function of the energy of the incident electron for a wide range of the model parameters, such as the strength and orientation of the exchange field, the barrier strength, and the distance between the two ferromagnetic layers. The tunneling transport processes in the graphene-based double junction GF/GI/$G_{S}$/GI/GF are compared with those in non-graphene-based junctions.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1092-1094
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Dependent Electron Tunneling in a Ferromagnet Superconductor Ferromagnet Junction
Autorzy:
Kowalewski, L.
Wojciechowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1810509.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.45.+c
74.50.+r
73.23.Ad
Opis:
The coherent spin polarized transport in ferromagnet/superconductor/ferromagnet double barrier junctions is analyzed. Using the Bogolubov-de Gennes equation with appropriate boundary conditions, we calculate probabilities of spin dependent transport processes in the ferromagnet/superconductor/ferromagnet junction. In particular, we discuss the nonlocal processes such as the crossed Andreev reflection and elastic co-tunneling. These processes contribute to tunneling a current when the distance between the two magnetic electrodes is comparable to the superconducting coherence length. The dependences of the tunneling transport processes on the strength of the exchange field in the ferromagnetic electrodes, and on the height of the tunnel barriers are presented.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 257-259
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasiparticles in Calcium Doped Yttrium-Iron Garnets
Autorzy:
Lehmann-Szweykowska, A.
Wojciechowski, R. J.
Gehring, G. A.
Tobijaszewski, I.
Powiązania:
https://bibliotekanauki.pl/articles/1955836.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
72.80.Ga
Opis:
In yttrium-iron garnets an electrical charge is carried by quasiparticles based on compensating holes which move either at oxygen or iron ions of the tetragonal sublattice. The quasiparticles can also get localized because of their coupling to optical phonons on the iron sites. A multi-band model of holes coupled to phonons is applied to find additional energy levels in the gap between the lower of the narrow 3d bands and the wide 2p band, whose occurrence plays a crucial role in a conductivity mechanism. The density of states is considerably modified by the interaction between the holes and local distortion of the lattice.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 423-426
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy Fermion Superconductor Order Parameter in High Magnetic Field
Autorzy:
Kowalewski, L.
Wojciechowski, R.
Thomas, M.
Nogala, M.
Powiązania:
https://bibliotekanauki.pl/articles/1930573.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Tx
74.60.-w
74.90.+n
Opis:
It is shown that, independently on either the nature and the strength of pairing, the orbital effects of a high magnetic field in heavy fermion superconductor change the form of both the effective pairing and the gap function.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 347-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Andreev Reflection and Creation of Spin-Entangled Charge Carriers in Double Barrier Junctions
Autorzy:
Wojciechowski, R.
Kowalewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1536594.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.45.+c
73.23.Ad
03.65.Ud
Opis:
We discuss spin dependent single particle charge transport as well as the spin pairwise entanglement processes in a double barrier junction. The junction consists of a superconductor connected to two normal or spin-polarized conductors, or semiconductors. Special attention is focused on a non-local process known as a crossed Andreev reflection. The non-local Andreev reflection occurs when an incident electron (hole) from one lead, injected with a subgap energy onto a superconducting layer, transforms into an Andreev hole (electron) in the second lead. At the same time, a Cooper pair is created in the superconductor. Using the Bogolubov-de Gennes equation with appropriate boundary conditions we calculate and discuss probabilities of processes relevant for charge transport through the junction. The dependence of the tunneling charge transport on the strength and orientation of the exchange field in the ferromagnetic electrodes, and on the height of the tunnel barriers as well as on the distance between the electrodes are presented. We discuss briefly the physics of creation and charge transport of spin entangled electron-hole pairs in the junction.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 249-253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Representation of the Lang-Kohn Density Profiles by the Numerical Fitting
Autorzy:
Rogowska, J. M.
Wojciechowski, K. F.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931191.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.30.+y
73.20.-r
Opis:
The numerical fitting of an analytical function representing electron density profile at a jellium surface to the one tabulated by Lang and Kohn is presented. The two sets of parameters entering the electron density profile is proposed. The first one is obtained by purely numerical fitting, and the second one is calculated under condition that electron density profile must satisfy the Budd-Vannimenus theorem. The obtained parameters are given as analytical functions of the Wigner-Seitz radius r$\text{}_{s}$ describing mean electron density n̅ in a metal (n̅$\text{}^{-1}$ = 4/3πr³$\text{}_{s}$ ). The comparison of presented electron density profile with variational trial function given by Perdew is also discussed.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 593-601
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Energy Spectrum of Single-Hole States in Transition Metal Oxides
Autorzy:
Lehmann-Szweykowska, A.
Wojciechowski, R. J.
Gehring, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/2013222.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
72.20.-i
Opis:
The p-d hybridised single-hole states of the transition-metal-oxygen tetrahedron (TMO$\text{}_{4}$) are collectivised due to the direct p-p hopping between oxygens of different clusters. The lowest-lying energy band is always narrow and fully occupied. The first excited band gets occupied as an effect of valence-uncompensated doping, so it can be almost localised. The possible hole excitations to the two higher energy bands, which are wider, may imply the Mott-like hopping form of charge transport in these systems.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 563-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility of the Rare Earth Ternary RNiSi$\text{}_{2}$ and RNiGe$\text{}_{2}$ Compounds
Autorzy:
Gil, A.
Szytuła, A.
Tomkowicz, Z.
Wojciechowski, K.
Zygmunt, A.
Powiązania:
https://bibliotekanauki.pl/articles/1929852.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
Opis:
The ternary silicides and germanides RNiX$\text{}_{2}$ (R - rare earth, X = Si or Ge) with the orthorhombic CeNiSi$\text{}_{2}$-type structure are investigated by magnetometric measurements. CeNiSi$\text{}_{2}$, CeNiGe$\text{}_{2}$ and SmNiGe$\text{}_{2}$ have a nonmagnetic state in low temperatures. The compounds with R = Pr and Nd are ferromagnets while those containing R = Gd-Er are antiferromagnets. The de Gennes scaling of the Néel temperatures indicates a strong influence of the crystalline-electric field effects.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 271-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Representation of Charge-Density Profile at a Jellium Surface Covered with the Alkali Metal Submonolayers
Autorzy:
Rogowska, J. M.
Wojciechowski, K. F.
Bogdanów, H.
Powiązania:
https://bibliotekanauki.pl/articles/1887583.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.30.+y
Opis:
A simple trial function for the electron density profiles at the surface of jellium covered by a submonolayer of alkali adatoms is proposed. The values of work function changes due to adsorption, computed by use of this function, are in good agreement with experimental data. It is shown also that the proposed earlier trial functions for the electron density profiles at the metal surface covered by metallic adlayers, give a wrong sequence of surface concentration of adatoms, at which the minimum of work function for different adsorbates occurs.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 707-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamental Gaps in $Cr_{8}$, $Cr_{7}Ni$ and $Cr_{7}Cd$ Molecules
Autorzy:
Brzostowski, B.
Wojciechowski, M.
Kamieniarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1368520.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
31.15.E-
71.10.-w
Opis:
In this paper we investigate fundamental gaps of three octametallic Cr-based molecular rings $Cr_{8}F_{8}(Piv)_{16}$, $Cr_{7}NiF_{8}(Piv)_{16}$ and $Cr_{7}CdF_{8}(Piv)_{16}$ using the SIESTA package. We find that for the ground-state antiferromagnetic configurations, the gap of the homometallic ring is significantly higher than those of the heterometallic rings. In addition, the HOMO and LUMO orbitals are plotted and discussed.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 234-235
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 40

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies