Spin characteristic classes and reduced $K{\rm Spin}$ group of a low-dimensional complex

Spin-polarized transport in low-dimensional systems

Spin dynamics in low-dimensional semiconductor structures

Résumé / Streszczenie Abstract This work is devoted to the studies of spin dynamics of magnetic Mn ions embedded in low-dimensional CdTe-based nanostructures. The particular emphasis is focused on the system of single CdTe quantum dots with single Mn ions, which give an insight into unperturbed interactions of magnetic ion with its semiconductor environment. A method of all-optical manipulation...

Spin relaxation in low dimensional systems

We review some of the newest findings on the spin dynamics of carriers and excitons in GaAs/GaAlAs quantum wells. In intrinsic wells, where the optical properties are dominated by excitonic effects, we show that exciton-exciton interaction produces a breaking of the spin degeneracy in two-dimensional semiconductors. In doped wells, the two spin components of an optically created two-dimensional...

Characteristic Classes of Complex Hypersurfaces

The Milnor-Hirzebruch class of a locally complete intersection X in an algebraic manifold M measures the difference between the (Poincaré dual of the) Hirzebruch class of the virtual tangent bundle of X and, respectively, the Brasselet-Schürmann-Yokura (homology) Hirzebruch class of X. In this note, we calculate the Milnor-Hirzebruch class of a globally defined algebraic hypersurface X in terms...

Adaptive Control of a Spin-Stabilized Spacecraft Using two Reaction Wheels and a 1DoF Gimbaled-Thruster

In impulsive orbital maneuvers, a large disturbance torque is generated by the thrust vector misalignment from the center of mass (C.M). The purpose of this paper is to reject the mentioned disturbance and stabilize the spacecraft attitude, based on the combination of a one degree of freedom (1DoF) gimbaled-thruster, two reaction wheels (RWs) and spin-stabilization. In this paper, the disturban...