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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of Hyperfine Interactions to Surface Investigations
    Autorzy:
    Budzyński, M.
    Sarzyński, J.
    Wasiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929322.pdf
    Data publikacji:
    1993-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.35.-p
    76.80.+y
    76.60.-k
    Opis:
    In this article the principles of measurements of hyperfine interaction parameters at a given depth in a sample are presented. The advantages and the limitations of the Mössbauer spectroscopy, perturbed angular correlations and nuclear magnetic resonance are described.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 5; 643-649
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Geometrical Parameters on the Transport Characteristics of Gated Core-Multishell Nanowires
    Autorzy:
    Palutkiewicz, T.
    Wołoszyn, M.
    Wójcik, P.
    Adamowski, J.
    Spisak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1185174.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    73.63.Nm
    85.35.-p
    Opis:
    Calculations of the current-voltage characteristics of the core-multishell nanowires for different radii of the core and various thicknesses of the shells are presented. A role of the conducting core and shells in the coherent transport under the influence of the gate voltage is discussed.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-111-A-113
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Inverse Problem for Quantum Graphs with One Cycle
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585121.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    Quantum graphs having one cycle are considered. It is shown that if the cycle contains at least three vertices, then the potential on the graph can be uniquely reconstructed from the corresponding Titchmarsh-Weyl function (Dirichlet-to-Neumann map) associated with graph's boundary, provided certain non-resonant conditions are satisfied.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 765-771
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Electronics: A Review of Experimental Results
    Autorzy:
    Erbe, A.
    Verleger, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808307.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.65.+h
    73.63.-b
    85.35.-p
    Opis:
    Molecular electronics aims for scaling down electronics to its ultimate limits by choosing single molecules as the building blocks of active devices. The advantages of this approach are the high reproducibility of molecular synthesis on the nanometer scale, the ability of molecules to form large structures by self-assembly, and the huge versatility of molecular complexes. On the other hand, conventional contacting techniques cannot form contacts on the single molecule scale and imaging techniques nowadays cannot provide a detailed image of such junctions. Therefore, the fabrication has to rely to some degree on self-organization of the constituents. The proof that a molecule has been contacted successfully can only be given by indirect methods, for example by measuring the current transport through the junctions. Here we give an overview of various techniques that were used successfully to contact molecules and to characterize them electrically. The techniques range from methods to contact single molecules to such which can be used to characterize ensembles of molecules. Especially, the comparison between such different techniques shows that a single measurement is always prone to artefacts originating from the unknown microscopic details of the junctions. It is therefore necessary to perform a statistically relevant number of measurements in order to resolve molecular properties. Various properties of the molecules can be studied. Special examples are the influence of conformational changes of the molecules, differences between various coupling endgroups of the molecules and effects of light-irradiation onto the molecular junctions.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 455-461
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport characteristics of gated core-multishell nanowires: Self-consistent approach
    Autorzy:
    Palutkiewicz, T.
    Wołoszyn, M.
    Wójcik, P.
    Spisak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058786.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    73.63.Nm
    85.35.-p
    Opis:
    The influence of the applied gate voltage on the coherent propagation of the conduction electrons through the InGaAs/InP core-multishell nanowires with the surrounding gate is considered. The solution of the three-dimensional Schrödinger equation within the effective mass approximation is found using the adiabatic method. The electrostatic potential distribution generated by the all-around gate is determined from the self-consistent procedure applied to the Schrödinger-Poisson problem. The Landauer-Büttiker formalism and quantum transmission boundary method are applied to calculate the transport properties of the considered nanosystem.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1190-1192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Spectral Gap for Laplacians on Metric Graphs
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399045.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    We discuss lower and upper estimates for the spectral gap of the Laplace operator on a finite compact connected metric graph. It is shown that the best lower estimate is given by the spectral gap for the interval with the same total length as the original graph. An explicit upper estimate is given by generalizing Cheeger's approach developed originally for Riemannian manifolds.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1060-1062
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse Problems for Quantum Graphs: Recent Developments and Perspectives
    Autorzy:
    Kurasov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492443.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Nk
    73.63.-b
    85.35.-p
    Opis:
    An introduction into the area of inverse problems for the Schrödinger operators on metric graphs is given. The case of metric finite trees is treated in detail with the focus on matching conditions. For graphs with loops we show that for almost all matching conditions the potential on the loop is not determined uniquely by the Titchmarsh-Weyl function. The class of all admissible potentials is characterized.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-132-A-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the hydrogen adsorption to the optical properties of boron nitride nanotubes
    Autorzy:
    Bayani, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070608.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Ch
    85.35.-p
    68.43.-h
    67.63.Cd
    67.80.ff
    Opis:
    In this research we have studied physisorption of hydrogen molecules on armchair (3,3) boron-nitride nanotube using density functional methods. Optical properties of the boron-nitride nanotube, with and without adsorbed H₂ molecules, were investigated under parallel and perpendicular polarized electric fields. The results indicate that the nanotube optical gap slightly changes due to H₂ physisorption and increasing H₂ physisorption suppresses the boron-nitride nanotube optical spectrum. Also, the nanotube gets more transparent as the H₂ concentration increases, in other words boron-nitride nanotube dielectric function decreases. Anisotropic dielectric function is another result which is determined by random phase approximation method.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 348-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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