Discretization of the total magnetic field by the nuclear spin bath in fluorine-doped ZnSe.

The coherent spin dynamics of fluorine donor-bound electrons in ZnSe induced by pulsed optical excitation is studied in a perpendicular applied magnetic field. The Larmor precession frequency serves as a measure for the total magnetic field exerted onto the electron spins and, surprisingly, does not increase linearly with the applied field, but shows a step-like behavior with pronounced plateaus, given by multiples of the laser repetition rate. This discretization occurs by a feedback mechanism in which the electron spins polarize the nuclear spins, which in turn generate a local Overhauser field adjusting the total magnetic field accordingly.

Radiation of charged-particle bunches passing perpendicularly by the edge of a semi-infinite planar wire structure.

The radiation of a charged-particle bunch moving perpendicularly to a semi-infinite plane grid composed of thin parallel wires is analyzed using the method of averaged boundary conditions (the period of the grid is assumed to be much less than the wavelengths under investigation). We perform an analysis of the volume radiation and surface waves generated by a bunch of finite length. It is shown that the patterns of the volume radiation fundamentally differ from those that arise in the case of an infinite grid.

Radiation of charges moving along the boundary of a wire metamaterial.

The electromagnetic fields of charges moving along the boundary of a "wire metamaterial" perpendicularly to the wires are investigated. The metamaterial under consideration represents a volume-periodic structure of thin parallel wires located in a square lattice. This structure is described by an effective permittivity tensor and exhibits both spatial and frequency dispersion.

Approximate method for calculating the radiation from a moving charge in the presence of a complex object.

An approximate method for calculating the radiation from a moving charge in the presence of a dielectric object is developed. The method is composed of two steps. The first step is calculation of the field in the medium without considering the external boundaries of the object, and the second step is an approximate (ray-optical) calculation of the wave propagation outside the object.

Nondivergent Cherenkov radiation in a wire metamaterial.

The electromagnetic radiation of a charge moving in an infinite 3D structure made of parallel wires is considered. The periods of the structure are assumed to be small; therefore, it can be described by an effective permittivity tensor. The charge velocity is perpendicular to the wires.

The HMG1 ta(i)le.

We have studied structural changes in DNA/protein complexes using the CD spectroscopy, upon the interaction of HMG1-domains with calf thymus DNA at different ionic strengths. HMG1 protein isolated from calf thymus and recombinant HMG1-(A+B) protein were used. Recombinant protein HMG1-(A+B) represents a rat HMG1 lacking C-terminal acidic tail.