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    Wyświetlanie 1-5 z 5
    Tytuł:
    Singlet-Triplet Switching Induced by Electric Field in Triple Quantum Dots
    Autorzy:
    Łuczak, J.
    Bułka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427582.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.-w
    33.57.+c
    73.23.-b
    73.63.Kv
    Opis:
    We analyze influence of an external electric field on magnetic properties of a triple quantum dot system in a triangular and linear geometry. The system contains four electrons and is described by an extended Hubbard model which includes electron correlations and exchange processes. The electric field leads to splitting of energy levels (the Stark effect) and to transition between the singlet and triplet states.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1195-1197
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dark States and Transport through Quantum Dots
    Autorzy:
    Tooski, S.
    Bułka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428598.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.-w
    33.57.+c
    73.23.-b
    73.63.Kv
    Opis:
    We consider current through triple and quadruple quantum dot systems in an in-plane electric field and in the sequential tunneling regime. The electric field breaks symmetry of the system and can trap electron in a dark state in which current flow can completely be blocked. Consequently rotating the electric field, one can observe current oscillations and blockades due to dark state.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1231-1233
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water Hydrogen Bonds Study by Opto-Magnetic Fingerprint Technique
    Autorzy:
    Koruga, Đ.
    Miljković, S.
    Ribar, S.
    Matija, L.
    Kojić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537894.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.57.+c
    42.25.Ja
    42.30.-d
    42.50.Ex
    Opis:
    Hydrogen bond has dual property, classical (electrostatic interaction based on Coulomb's law) and quantum (wave function based on Schrödinger equation). Since Planck's constant is one of the main criteria for decision which process is quantum, or how much is close to be quantum, we use electrical and magnetic forces of valence electrons, as point of departure, to develop method for opto-magnetic fingerprint of matter. During the study of different type of matter we observed phenomena from spectral convolution data of digital images which characterize matter from both covalent and non-covalent bonding. Since water is matter that is most abundant with hydrogen bonds, we present results of 18.2 MΩ water investigation on different temperature and under influence of constant and variable magnetic fields by opto-magnetic method. Bearing in mind that Linus Pauling, in his book Nature of the Chemical Bond (Cornel University Press, 1939), for the first time presented the systematic concept of the hydrogen bond to the molecular world and its machinery, this paper is written in honor to him and 70th anniversary of one of the most important scientific paradigm.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 777-781
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of High Efficiency Electromagnetically Induced Transparency in Potassium Vapor
    Autorzy:
    Gozzini, S.
    Slavov, D.
    Cartaleva, S.
    Marmugi, L.
    Lucchesini, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791196.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.57.+c
    31.15.B
    32.80.Xx
    32.50.+d
    32.60.+i
    Opis:
    We present a rate-equation theoretical model describing the optical pumping processes on the K $D_{1}$ line and we then discuss their influence on the electromagnetically induced transparency resonance parameters. We present also a comparison with the results of an experiment performed in cells containing pure alkali metal or added with a few torrs of buffer gas. The model shows that, in the last case, the complete Maxwellisation of the atomic population velocity distribution, along with the overlapping Doppler profiles of the transitions from the ground-states typical of K, leads to a partial compensation of optical pumping and a significant increase of the amplitude of the electromagnetically induced transparency resonances.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 489-491
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opto-Magnetic Method for Epstein - Barr Virus and Cytomegalovirus Detection in Blood Plasma Samples
    Autorzy:
    Papić-Obradović, M.
    Kojić, D.
    Matija, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537895.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.57.+c
    42.25.Ja
    42.30.-d
    42.70.Jk
    87.19.xd
    Opis:
    Motivated by characterization of paramagnetic materials (Al, Mn and Ti) and diamagnetic materials (Cu, C and Zn) by opto-magnetic method that is based on light-matter interaction using digital imaging, we present results of Epstein-Barr virus (EBV) and cytomegalovirus (CMV) detection in blood plasma. To investigate light-blood plasma interaction we use wavelength difference of diffuse white light and reflected polarized light in red and blue channels of digital images (opto-magnetic method). Digital images of samples are analyzed by spectral convolution algorithm for light-matter interaction analysis. Since opto-magnetic method can detect very small difference between normal and pathological tissue states it is advantageous in comparison with classical methods. Especially it is important for early detection of suspicious tissue states and detection of viral infection presence in plasma. We compared our results with results of standard biomedical test for EBV and CVM, as a reference, and found out for group of 40 samples significant correlation of 93. 6%.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 782-785
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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