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Wyszukujesz frazę "Tkach, M." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Transmission Canals for the Photon-Assisted Transport of Electron through the Double-Barrier Resonant Tunneling Structure
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399516.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    73.63.Hs
    68.65.Fg
    Opis:
    The resonance and non-resonance transmission canals of double-barrier resonant tunneling structure are established for the electron-photon system using the exact solution of one-dimensional non-stationary Schrödinger equation expanded into the Fourier range. It is shown that besides the main and satellite, the mixed quasi-stationary states which cause the appearance of specific transmission canals with the properties strongly dependent on the intensity and frequency of electromagnetic field, exist in the nanostructure.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 94-101
    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:
    Dynamic Conductivity of Electrons and Electron-Phonon Interaction in Open Three-Well Nanostructures
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Grynyshyn, Y.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401886.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kd
    78.67.De
    72.10.Di
    Opis:
    The theoretical description of electronic tunneling transport through the three-well nanostructure $(In_{0.53}Ga_{0.47}As/In_{0.52}Al_{0.48}As)$, being an expanded active region of quantum cascade detector, is presented. Using the solution of the Schrödinger equation, the dynamic conductivity caused by quantum transitions due to the interaction of electrons with electromagnetic field and phonons is calculated. Within the Green functions approach, the electron spectrum, renormalized due to the interaction with confined optical and interface phonons is obtained at cryogenic and room temperatures. The role of different mechanisms of electron-phonon interaction in the formation of temperature shifts, decay rates of electron states and electromagnetic field absorption bands is investigated. It is shown that independently of the temperature, the contribution produced by interface phonons into renormalized electron spectrum is several times bigger than that of confined phonons. However, the experimentally observed long-wave shift and broadening of absorption band at higher temperatures is, mainly, caused by the decreasing heights of resonant tunneling structure potential barriers.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 343-352
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Conductivity in Open Cylindrical Two-Barrier Symmetric Resonance Tunnel Structure
    Autorzy:
    Tkach, M.
    Makhanets, O.
    Seti, Ju.
    Dovganiuk, M.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537805.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Hb
    73.21.La
    73.40.Gk
    Opis:
    The theory of resonance energies and widths of electron quasi-stationary states and electronic conductivity in open cylindrical two-barrier symmetric resonance tunnel structure is developed. The complete Schrodinger equation is solved within the model of effective masses for rectangular potential wells and barriers. Interaction between electrons and electromagnetic field was taken into account using the approximation of the small signal. The calculations of spectral parameters are performed for $In_{0.53}Ga_{0.47}As$/$In_{0.52}Al_{0.48}As$ resonance tunnel structure. The dependences of conductivity on the energy of mono-energy electrons beam falling at the system and electromagnetic field energy absorbed or emitted by the system are obtained and analyzed. The relation between experimentally measured parameters of conductivity and resonance widths of electron quasi-stationary states in open resonance tunnel structure is established.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 965-970
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity in U-T Alloys (T = Mo, Pt, Nb, Zr) Stabilized in the Cubic γ-U Structure
    Autorzy:
    Sowa, S.
    Kim-Ngan, N.
    Krupska, M.
    Paukov, M.
    Tkach, I.
    Havela, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398594.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    74.70.Ad
    72.15.Cz
    Opis:
    Using ultrafast cooling (with the cooling rate up to 10⁶ K/s) helps to minimize the T-alloying concentration (T = Mo, Pt, Pd, Nb, Zr) necessary to retain the γ-U phase down to low temperatures. All investigated splat-cooled U-T alloys become superconducting with $T_{c}$ in the range of 0.61-2.11 K. The bulk character of superconductivity can be concluded for some of the splats when comparing the specific-heat anomaly at $T_{c}$ with the BCS theory prediction.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 521-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines
    Autorzy:
    Prikhna, T.
    Gawalek, W.
    Savchuk, Ya.
    Sergienko, N.
    Moshchil, V.
    Sokolovsky, V.
    Vajda, J.
    Tkach, V.
    Karau, F.
    Weber, H.
    Eisterer, M.
    Joulain, A.
    Rabier, J.
    Chaud, X.
    Wendt, M.
    Dellith, J.
    Danilenko, N.
    Habisreuther, T.
    Dub, S.
    Meerovich, V.
    Litzkendorf, D.
    Nagorny, P.
    Kovalev, L.
    Schmidt, Ch.
    Melnikov, V.
    Shapovalov, A.
    Kozyrev, A.
    Sverdun, V.
    Kosa, J.
    Vlasenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549637.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Sv
    74.81.Bd
    74.70.Ad
    74.78.Na
    74.62.Fj
    74.25.Ld
    74.62.Dh
    74.25.Ha
    Opis:
    Materials of the Y-Ba-Cu-O (melt-textured $YBa_{2}Cu_{3}O_{7-δ}$-based materials or MT-YBCO) and Mg-B-O ($MgB_{2}$-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800°C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of $MgB_{2}$-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 $μm^{-1}$), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of $MgB_{2}$-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-$MgB_{12}$ stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high $T_{c}$ (37 K) and critical current densities in materials with $MgB_{12}$ matrix (with 95% of shielding fraction as calculated from the resistant curve).
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 7-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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