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Wyświetlanie 1-10 z 47
Tytuł:
Overhauser effect and anisotropy of electron spin g-factor in GaAs / AlGaAs quantum wells
Autorzy:
Ito, T.
Shichi, W.
Ichida, M.
Gotoh, H.
Kamada, H.
Ando, H.
Tematy:
quantum well
electron spin g-factor
Overhouser effect
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/385175.pdf  Link otwiera się w nowym oknie
Opis:
To investigate the dependence of electron g-factor on magnetic field in GaAs / AlGaAs quantum wells time-resolved photoluminescence measurements under a high magnetic field in different experimental configuration, the magnetic field perpendicular (g up tack ) and parallel (g II) to the quantum confinement direction, has been studied. When the angle between the magnetic field and the confinement direction is 45°, the precession frequency varies depending on polarity of magnetic field and the circular polarization type of excitation light (sigma+ or sigma-). We found that these dependences of the precession frequency exhibit main features of Overhauser effect with an effective magnetic field of 0.5 T that nuclear spins react back on electron spin precession and the g-factor value is not affected by the effective magnetic field. The g+ and gii values agree well with the results of four-band k • p perturbation calculations.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Применения харьковского потенциала в теории ядерных сил и ядерных реакций
Primeneniâ Harʹkovskogo potenciala v teorii âdernyh sil i âdernyh reakcij
Application of the Kharkov potential in the theory of nuclear forces and nuclear reactions
Autorzy:
Yakovlev, S.
Arslanaliev, A.
Witała, Henryk
Kamada, H.
Stepanova, M.
Shebeko, A.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Possible extension of the three-body force by the unitary clothing transformations method in the Faddeev equations
Autorzy:
Stepanova, M.
Arslanaliev, A.
Shebeko, A.
Frolov, P.
Witała, Henryk
Kamada, H.
Golak, Jacek
Skibiński, Roman
Opis:
The Kharkov potential is a recent field theoretical model of nucleon-nucleon interaction that has been built up in the framework of the instant form of relativistic dynamics starting with the total Hamiltonian of interacting meson and nucleon fields and using the method of unitary clothing transformations. The latter connect the representation of “bare” particles and the representation of “clothed” particles, i.e., the particles with physical properties. By trying to overcome available inconsistencies when constructing the models of 2N- and 3N-forces, we will show how one can within the clothed particle representation build them on one and the same physical footing. Unlike our preceding explorations we show fresh results with best-fit values for adjustable parameters revisited.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Nucleon-deuteron scattering with the JISP16 potential
Autorzy:
Shirokov, A. M.
Okamoto, R.
Golak, Jacek
Skibiński, Roman
Volkotrub, Yuriy
Suzuki, K.
Kamada, H.
Vary, J. P.
Witała, Henryk
Topolnicki, Kacper
Opis:
The nucleon-nucleon J-matrix inverse scattering potential JISP16 is applied to elastic nucleon-deuteron scattering and the deuteron breakup process at the laboratory nucleon energies up to 135 MeV. The formalism of the Faddeev equations is used to obtain three-nucleon scattering states. We compare predictions based on the JISP16 force with data and with results based on various two-body interactions, including the CD Bonn, the Argonne AV18, the chiral force with the semilocal regularization at the fifth order of the chiral expansion and with low-momentum interactions obtained from the CD Bonn force as well as with the predictions from the combination of the AV18 NN interaction and the Urbana IX 3N force. JISP16 provides a satisfactory description of some observables at low energies but strong deviations from data as well as from standard and chiral potential predictions with increasing energy. However, there are also polarization observables at low energies for which the JISP16 predictions differ from those based on the other forces by a factor of two. The reason for such a behavior can be traced back to the P-wave components of the JISP16 force. At higher energies the deviations can be enhanced by an interference with higher partial waves and by the properties of the JISP16 deuteron wave function. In addition, we compare the energy and angular dependence of predictions based on the JISP16 force with the results of the low-momentum interactions obtained with different values of the momentum cutoff parameter. We found that such low-momentum forces can be employed to interpret the nucleon-deuteron elastic scattering data only below some specific energy which depends on the cutoff parameter. Since JISP16 is defined in a finite oscillator basis, it has properties similar to low momentum interactions and its application to the description of nucleon-deuteron scattering data is limited to a low momentum transfer region.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 47

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