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    Wyświetlanie 1-7 z 7
    Tytuł:
    Specific Heat and Magnetism of $LuFe_6Al_6$
    Autorzy:
    Svoboda, P.
    Andreev, A.
    Šantavá, E.
    Šebek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813662.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    65.40.Ba
    Opis:
    Here we present the results of the zero-field specific heat study of the $LuFe_6Al_6$ single crystal. The specific heat data were analyzed as a sum of the phonon, electronic, and magnetic contributions, respectively. The analysis of the phonon part involves three acoustic and 36 optical branches, respectively, all of them corrected for the anharmonicity. The magnetic part of the specific heat was obtained by subtracting the electronic and the phonon part from the experimental specific heat and the magnetic entropy was calculated.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 307-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Transport in Double Quantum Dot Cooper Pair Splitters in the Presence of External Magnetic Field
    Autorzy:
    Trocha, P.
    Weymann, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386830.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    73.21.La
    74.45.+c
    Opis:
    The effect of external magnetic field on the transport properties of double quantum dots coupled to normal and superconducting leads is studied by means of the real-time diagrammatic technique in the sequential tunneling regime. This device works as a gate-controlled Cooper pair splitter. We focus on the transport regime where the current is blocked due to the spin triplet blockade. It is shown that external magnetic field can modify the Andreev current and differential conductance. In particular, magnetic field can suppress the negative differential conductance associated with the triplet blockade.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 502-504
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Conductance through a Quantum Dot Strongly Coupled to Ferromagnetic and Superconducting Leads
    Autorzy:
    Wójcik, K.P.
    Weymann, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032390.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    72.15.Qm
    74.45.+c
    72.25.-b
    Opis:
    We analyze the Andreev conductance through a quantum dot strongly coupled to one ferromagnetic and one superconducting lead. The transmission due to the Andreev reflection is obtained from the numerical renormalization group method. We show that at low temperatures, depending on the dot level position, the Andreev conductance exhibits a peak at zero bias due to the Kondo effect, which can be split by the exchange field due to spin-dependent coupling to ferromagnetic lead.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 143-145
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys
    Autorzy:
    Hašková, V.
    Szabó, P.
    Kováč, J.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385695.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Ba
    74.45.+c
    77.80.bg
    Opis:
    The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and $Co₂Cr_{0.6}Fe_{0.4}Al$ ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for $Co₂Cr_{0.6}Fe_{0.4}Al$. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of $Co₂Cr_{0.6}Fe_{0.4}AlP₀$ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in $Co₂Cr_{1-x}FeₓAl$ Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 377-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Majorana Fermions on Andreev Spectroscopy of Multiband Topological Superconductors
    Autorzy:
    Silva, A.
    Araújo, M.
    Sacramento, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402577.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.10.Pm
    71.10.Li
    73.20.-r
    74.45.+c
    74.20.Rp
    74.70.-b
    Opis:
    We introduce a model for a multiband topological superconductor with two orbitals per lattice site, in two spatial dimensions. Concentrating on the Andreev reflection problem, the appropriate wave function matching conditions for an interface with a normal single-band metal were previously derived in the framework of a quantum waveguide theory. This theory retrieves the correct number of Majorana fermion states as predicted by the topological index. We obtain the differential conductance as a function of bias voltage, which displays the contribution of the Majorana fermions. Interface disorder is also considered. By varying band structure parameters, topological transitions can be induced, whereby the number of the Majorana modes varies. We calculate the effect of such transitions on the differential conductance.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 210-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Optical Characteristics of $n-GaSb//n-GaIn_{0.24}AsSb//p-GaAl_{0.34}AsSb$ Heterostructure Photodiode
    Autorzy:
    Ahmetoglu, M.
    Kucur, B.
    Andreev, I.
    Kunitsyna, E.
    Mikhailova, M.
    Yakovlev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401231.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.-i
    73.40.Kp
    72.40.+w
    Opis:
    In the present paper, electrical and optical properties of $n-GaSb//n-GaIn_{0.24}AsSb//p-GaAl_{0.34}AsSb$ double heterostructure (DH) with a diameter of 0.3 mm are reported. The current-voltage (I-V) characteristics of the structure were investigated at several temperatures in both, dark and under the illumination conditions. The effect of illumination was studied at different intensity values. Short circuit current and open circuit voltage as a function of intensity of incident light in photovoltaic mode are investigated.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1007-1009
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Absorption and Photoluminescence in Quantum Dots and Artificial Molecules
    Autorzy:
    Firsov, D.
    Vorobjev, L.
    Panevin, V.
    Fedosov, N.
    Shalygin, V.
    Samsonenko, J.
    Tonkikh, A.
    Cirlin, G.
    Andreev, A.
    Kryzhanovskaya, N.
    Tarasov, I.
    Pikhtin, N.
    Ustinov, V.
    Hanna, S.
    Seilmeier, A.
    Julien, F.
    Zakharov, N.
    Werner, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041673.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Fs
    Opis:
    Intraband absorption in n- and p-doped structures with InAs/GaAs quantum dots covered by InGaAs layers is studied both experimentally and theoretically. The absorption cross-section for p-type quantum dots was found to be significantly smaller than that for n-type quantum dots. Interband absorption bleaching under strong interband excitation is found and investigated in undoped quantum dot structures. Structures with artificial molecules were grown. Photoluminescence spectra and transmission electron microscopy images proves the presence of coupled symmetrical quantum dots.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 158-162
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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