We investigate explicitly the large coupling limit of the renormaliz-able interactions of particles of spin l/2 and spin 0. This is done with a previously formulated theory of strong coupling. The principal result of the investigation is the complete decoupling of spin l/2 particles from those of spin 0 in the large coupling regime. The applications of our findings to semiclassical models of qu...

Indirect nuclear spin-spin coupling constants J(11B,1H) and J(11B, 11B) in neutral and anionic boron hydrides 1 – 17, calculated at the B3LYP/6-311+G(d,p) level of theory, are in good agreement with experimental data if available. This is shown for [BH4]− (1), B2H6 (2), B4H10 (3), B5H9 (4), or [B2H7]− (12). The calculations can be used to obtain values for those coupling constants for which exp...

We present a simple and pedagogical derivation of the spin current as the linear response to an external electric field for both Rashba and Luttinger spin–orbital coupling Hamiltonians. Except for the adiabatic approximation, our derivation is exact to the linear order of the electric field for both models. The spin current is a direct result of the difference in occupation levels between diffe...

We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse. Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- depend...

For the analysis of the spin-dipole (SD) term of the indirect NMR spin–spin coupling constant, the SD spin-polarization distribution and the SD energy density distribution are derived and used to explain magnitude and sign of the SD term. Orbital pairs (occupied, virtual) are identified that are most important for the SD spin–spin coupling mechanism. The induction of strong SD spin-polarization...

We derive an intrinsic contribution to the non-adiabatic spin torque for non-uniform magnetic textures. It differs from previously considered contributions in several ways and can be the dominant contribution in some models. It does not depend on the change in occupation of the electron states due to the current flow but rather is due to the perturbation of the electronic states when an electri...

The nature of Mashhoon’s spin-rotation coupling is the interaction between a particle spin (gravitomagnetic moment) and a gravitomagnetic field. Here we will consider the coupling of graviton spin to the weak gravitomagnetic fields by analyzing the Lagrangian density of weak gravitational field, and hence study the purely gravitational generalization of Mashhoon’s spin-rotation couplings. PACS ...

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