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    Wyświetlanie 1-9 z 9
    Tytuł:
    Electronic Structure and Transport Properties of UFe$\text{}_{2}$ System
    Autorzy:
    Szlaferek, A.
    Szajek, A.
    Baszyński, J.
    Smardz, L.
    Kowalczyk, A.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013662.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.La
    71.20.Lp
    72.15.Eb
    Opis:
    The electronic structure of the UFe$\text{}_{2}$ compound was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding muffin tin orbital method. This compound crystallizes in a cubic Laves phase. The calculated valence band spectrum is characterized by two peaks due to U(5f) and Fe(3d) states. We have found a good agreement between the experimental valence band spectrum and theoretical ab initio calculations. The carrier concentration estimated from the Hall effect amounts to ≈10$\text{}^{22}$ cm$\text{}^{-3}$.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 815-818
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Local Environment on the Magnetic Properties of the Ordered Fe$\text{}_{1-x}$Al$\text{}_{x}$ Alloy
    Autorzy:
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013232.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.La
    71.15.Fv
    71.20.Lp
    75.50.Bb
    75.30.-m
    Opis:
    The electronic and magnetic properties of the ordered binary Fe$\text{}_{1-x}$Al$\text{}_{x}$ alloy with the B2 crystal structure were calculated for Al concentrations x=0.1875-0.5 using the supercell structure. The calculations showed that for increasing Al contents the average magnetization of Fe$\text{}_{1-x}$Al$\text{}_{x}$ falls down rapidly. Upon lowering the unit cell volume, almost all configurations of compositions with x ≥ 0.25 show the abrupt change of magnetic state from the high moment magnetic state to the low moment magnetic state with the moment reduction 0.6-0.8 μ$\text{}_{B}$ per atom. The configurations were found for which the low moment magnetic state solutions with the antiferromagnetic alignment of magnetic moments of Fe atoms at antisite positions are stable.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 583-586
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Order on the Structural and Magnetic Properties of Fe-X (X=Al, Si) Alloys with B2 Structure
    Autorzy:
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014406.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    71.15.La
    75.50.Bb
    75.30.-m
    71.15.Fv
    Opis:
    Previous ab initio super-cell calculations of the magnetic properties of the ordered Fe$\text{}_{1-x}$Al$\text{}_{x}$ alloy in the B2 structure are extended to include the disordered state of the alloy and completed with the calculations for ordered and disordered Fe$\text{}_{1-x}$Si$\text{}_{x}$ alloys. The configurations of the Fe atoms in the anti-site (AS) positions of Fe-X super-cell with the antiferromagnetic order were found. The ground state of Fe$\text{}_{1-x}$Al$\text{}_{x}$ with x≃ 0.3 shows the antiferromagnetic order of the Fe-AS magnetic moments. The concentration dependence of the equilibrium lattice parameter and magnetic moment of Fe$\text{}_{1-x}$X$\text{}_{x}$ in the ordered and disordered state differ qualitatively.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 543-546
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Local Environment on the Electronic Structure and Magnetic Properties of Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb Alloys
    Autorzy:
    Jezierski, A.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013241.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.Ar
    31.15.Ew
    71.15.Mb
    71.15.-m
    71.15.La
    71.20.-b
    71.20.Be
    Opis:
    The magnetic ordering in Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb alloys changes from ferromagnetic (x=0) to antiferromagnetic (x=1). The X-ray and neutron diffraction showed that the systems crystallise in C1$\text{}_{b}$ type structure. We present an influence of the local chemical ordering on the electronic and magnetic properties of Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb alloys. The band structure and the magnetic moments were calculated by the spin-polarised linear muffin-tin orbital in the atomic sphere approximation method for the experimental values of the lattice parameters. The magnetic moment of Mn increases from 3.8 μ$\text{}_{B}$ for x=0 to 4.18 μ$\text{}_{B}$ for x=1.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 607-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-Scale Simulations of Semiconductor Nanostructures
    Autorzy:
    Zieliński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419515.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    78.67.Hc
    71.15.-m
    71.15.Qe
    Opis:
    We demonstrate a multi-domain scheme for calculation of electronic and optical properties of semiconductor nanostructures. Three progressively smaller computational domains are used for strain simulation, single particle states calculation and computation of the Coulomb scattering matrix elements. Proposed approach offers a significant reduction of computational time and memory savings without sacrificing the accuracy of obtained spectra. We illustrate this method on the example of InAs/InP self-assembled quantum dots.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 312-315
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagrammatic Perturbation Technique for a Quantum Dot Connected to Superconducting Leads
    Autorzy:
    Pokorný, V.
    Janiš, V.
    Novotný, T.
    Žonda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201960.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.-m
    73.21.La
    74.50.+r
    Opis:
    We study spectral properties of a quantum dot attached to two superconductors with nonzero phase difference. The system is described as a single-impurity Anderson model coupled to BCS superconducting leads. We utilize diagrammatic perturbation expansion in the Coulomb interaction to capture relevant physical phenomena, particularly the effect of the Coulomb interaction on the Andreev bound states present in the electronic spectrum. Results of the Hartree-Fock and the random phase approximations at zero temperature are presented.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 352-353
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled Multiphysics Models for the Analysis οf the Conduction and Valence Band Eigenenergies in Cylindrical Quantum Dots
    Autorzy:
    Prabhakar, S.
    Takhtamirov, E.
    Melnik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490797.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.-m
    73.21.La
    62.23.Eg
    Opis:
    We develop a mathematical model for the analysis of conduction and valence band eigenenergy in quantum dots. We apply the model to study the band structure calculations of low dimensional semiconductor nanostructures such as wurtzite AlN/GaN quantum dots in cylindrical coordinates in presence of applied magnetic field along z-direction. We use a finite element method to solve the resulting model and to obtain eigenvalues and wave functions of cylindrical quantum dots. We provide details of the methodology of solution and appropriate boundary conditions. A special attention is given to the case of applied magnetic field along z-direction, we found localized eigenstates and wave functions in the conduction and valence bands for which our results open new possibilities for the design of the optoelectronics devices where the combination of electron-hole pairs can be used as tuning parameters.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 85-88
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron and Exciton Quasi-Stationary s-States in Open Spherical Quantum Dots
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419890.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Dx
    73.21.La
    73.22.Dj
    73.90.+f
    Opis:
    The theoretical calculation of spectral parameters of electron and exciton quasi-stationary s-states in open spherical quantum dot is performed within the effective mass approximation and rectangular potentials model. The conceptions of probability distribution functions (over quasi-momentum or energy) of electron location inside of quantum dot and their spectral characteristics: generalized resonance energies and widths are introduced. It is shown that the generalized resonance energies and widths, obtained within the distribution functions, satisfy the Heisenberg uncertainty principle for the barrier widths varying from zero to infinity. At the same time, the ordinary resonance energies and widths defined as complex poles of scattering S-matrix, do not satisfy it for the small barrier widths and, therefore, are correct only for the open quantum dots with rather wide potential barriers.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 207-211
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomistic Calculation of Coulomb Interactions in Semiconductor Nanocrystals: Role of Surface Passivation and Composition Details
    Autorzy:
    Chwastyk, M.
    Różanski, P.
    Zieliński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419534.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    78.67.Bf
    78.67.Hc
    73.20.Fz
    71.15.-m
    Opis:
    We report a theoretical investigation of electronic properties of semiconductor InAs and GaAs nanocrystals. Our calculation scheme starts with the single particle calculation using atomistic tight-binding model including spin-orbital interaction and d-orbitals. Then the exciton binding energies are calculated with screened Coulomb interaction. We study the role of surface passivation effects by varying value of surface passivation potential. We compare results obtained with dot center positioned on different lattice sites thus containing different number of anion and cations. We conclude that passivation of surface states affects significantly single particle energies and the value of electron-hole Coulomb attraction. Interestingly, due to limited screening, the short-range (on-site) contribution to the electron-hole Coulomb attraction plays significant role for small nanocrystals with radius smaller than 1 nm.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 324-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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