Results 1 - 10 of 27521
Results 1 - 10 of 27521. Search took: 0.045 seconds
|Sort by: date | relevance|
[en] Highlights: • The interfacial spin polarization are modulated by the interfacial angle. • Spin polarization is determined by pz-d hybridization and sp3-d hybridization. • Angle dependence of pz-d hybridization and sp3-d hybridization is revealed. Based on ab initio theory, we theoretically investigated the interfacial spin polarization by adsorbing a benzene-dithiolate molecule onto a nickel surface with different interfacial angles. A variable magnitude and even an inversion of the interfacial spin polarization are observed with the increase of the interfacial angle. The orbital analysis shows that the interfacial spin polarization is codetermined by two kinds of orbital hybridization between the molecule and the ferromagnet, the pz-d hybridization and the sp3-d hybridization, which show different dependence on the angle. These results indicate a new way to manipulate the spin polarization at organic spinterface.
[en] A fusing plasma with coherently polarized spin nuclei can be subject to instabilities due to the anisotropy of the reaction products distribution in velocity space that is a result of their polarization. The characteristics of these instabilities depend strongly on the plasma spatial inhomogeneities and a significant rate of spin depolarization can be produced by them if adequate fluctuation amplitudes are reached. The results of the relevant analysis are, in addition, of interest for plasma heating processes with frequencies in the range of the cyclotron frequencies of the considered nuclei. (author)
[en] The dynamics of the two-level atom with the optical transition Jg→Je=Jg+1 under the effect of the resonance radiation of the elliptical polarization and in the presence of the constant magnetic field, directed along the radiation wave vector, is studied in the approximation of the quasi-classical description of the angular moment orientation. It is shown, that there takes place the two-scale time evolution of the atoms distribution by the angular moment orientation. At the first stage during comparatively short time periods after the radiation switch-on the atoms are oriented by their angular moment both along the magnetic field and in the opposite direction, depending on their initial orientation and radiation ellipticity rate. There after at the second stage there takes place the more prolonged process of the atoms distribution, when they are oriented mainly in one of the above-mentioned directions. The second stage duration exponentially depends on the value of the J angular moment
[ru]В приближении квазиклассического описания ориентации углового момента исследуется динамика двухуровневого атома с оптическим переходом Jg→Je=Jg+1 под воздействием резонансного излучения эллиптической поляризации и в присутствии постоянного магнитного поля, направленного вдоль волнового вектора излучения. Показано, что имеет место двухмасштабная временная эволюция распределения атомов по ориентации углового момента. На первом этапе после включения излучения в сравнительно короткие времена атомы ориентируются по своему угловому моменту как вдоль магнитного поля, так и противоположном направлении в зависимости от своей исходной ориентации и степени эллиптичности излучения. Затем на втором этапе происходит более длительный процесс перераспределения атомов, когда они ориентируются преимущественно только в одном из указанных направлений. Длительность второго этапа экспоненциально зависит от величины углового момента J
[en] We study the tunneling of a spin polarized Fermi gas in a three-dimensional double-well potential, focusing on the time dynamics starting from an initial state in which there is an imbalance in the number of particles in the two wells. Although fermions in different doublets of the double well tunnel with different frequencies, we point out that (incoherent) oscillations of a large number of particles can arise, as a consequence of the presence of transverse degrees of freedom. Estimates of the doublet structure and of the occupation of transverse eigenstates for a realistic experimental setup are provided. (paper)
[en] Highlights: • Chiral structure is spin-selective when being applied as a pathway for electron transfer. • CISS (Chiral-Induced Spin Selectivity) effect can be utilized to manufacture high-efficiency microelectronic devices. • CISS effect provides sound explanations for some chemical and biological procedures such as precise bio-recognition. Spin-polarization can be essential in many cases of vital importance to the procedures of chemical and biological function. Its realization and utilization have been drawing intensively growing attention for over half a century, whereby numerous strategies get developed with related mechanisms proposed. Furthermore, spintronics has evolved as a scientific domain in which efforts are made to better understand the electron's intrinsic quantum properties based on its angular momentum. To date, an effective approach for aligning the electrons’ spin usually employs an external magnetic field, which may not be viable or efficient in all applications. This review emphasizes on the advances of spintronics where the polarization of spin is able to be implemented by other means than an external magnetic field. The key role of chiral structures for filtering the electrons on spin along with the approaches applied to monitor the polarization of spin will get introduced. Moreover, theoretical frameworks rationalizing the experimental results obtained are also presented herein. The thread running through all of these will be the proposal and evolution of Chiral-Induced Spin Selectivity (CISS) effect.
[en] Following Margenau and Hill we adduce arguments to show that an aligned spin-1 system (for e.g. 2H or 14N nuclei in external electric quadrupole fields) can be viewed in terms of bivariate probability distributions obtained by identifying the associated characteristic function. (author)
[en] Polarization losses of a charged particle passing through a plasma in homogeneous high frequency electric field are considered. It is shown that due to the variation of plasma dispersion in the external field, the terms appear in the expression for polarization losses which depend on the energy of the particle and the reaching of ionization loss plateau with the increase of frequency takes place at higher energies