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Homogeneous Magnetic Field (homogeneous + magnetic_field)

Distribution by Scientific Domains
Physics and Astronomy50%

Selected Abstracts

Confinement of magnetoexcitons in GaAs quantum well with a superconducting disk on top of the well

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 15 2006
Z. G. Koinov
Abstract We study the confinement of magnetoexcitons in quantum wells in the presence of a strong external homogeneous magnetic field and a cylindrical symmetric inhomogeneous magnetic field created by a superconducting disk, placed on the top of the well. We calculate numerically the trapping energy and the corresponding center-of-mass wave function of magnetoexcitons in a GaAs single quantum well. The calculations clearly indicate the formation of bound exciton states with nonzero values for the center-of-mass exciton wave function only in a sufficiently small area. This effect of exciton trapping can be used to design new functional nanoelectronic devices. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Exciton-donor complexes in a semiconductor quantum dot in a magnetic field

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 4 2006
A. P. Djotyan
Abstract The binding energy of the ground state of a charged exciton-donor complex in a spherical semiconductor quantum dot in the presence of a homogeneous magnetic field has been calculated. The theoretical analysis is carried out using a variational approach in the framework of the adiabatic approximation. The behavior of the binding energy of the complex in a QD on magnetic field is investigated for different values of the QD radius. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Accurate rocking-curve measurements on protein crystals grown in a homogeneous magnetic field of 2.4,T

ACTA CRYSTALLOGRAPHICA SECTION D, Issue 6 2004
Daniel Lübbert
Differences in mosaicity between lysozyme crystals grown inside and outside a homogeneous magnetic field of 2.4,T and with and without agarose gel were investigated by X-ray diffraction rocking-curve measurements. High angular resolution was achieved using an Si(113) four-reflection Bartels monochromator. The results show that (i) all crystals were highly perfect, (ii) the mosaicities were clearly anisotropic and (iii) the mosaicities varied more strongly within each group of crystals (grown under identical conditions) than the average values across groups. In particular, the effect of the magnetic field on crystal mosaicity was found to be very small. Finally, the spatial distribution of mosaic blocks inside a protein crystal was visualized with a novel diffraction technique using a high spatial resolution two-dimensional CCD detector. [source]