4,219 research outputs found
Skyrmions coupled with the electromagnetic field via the gauged Wess-Zumino term
In soliton models expressed in terms of the non-linear chiral field, the
electric current has an anomalous gauge-field contribution as the baryon
current does. We study the spin polarized Skyrmions coupled with the
electromagnetic field via the gauged Wess-Zumino term and calculate
configurations of the Skyrmion and the gauge field with boundary conditions to
ensure the physical charge number for baryons.
Although the electromagnetic field via the gauged Wess-Zumino term affects
physical quantities in small amounts, we find that the magnetic field forms a
dipole structure owing to a circular electric current around the spin
quantization axis of the soliton. This is understood on an analogy with the
Meissner effect in the super conductor.The electric charge distributions turn
out to have characteristic structures depending on the total charge, which
suggests the intrinsic deformation of baryons due to orbital motions of the
constituents.Comment: 8 pages, 5 figure
High Throughput Oxide Lattice Engineering by Parallel Laser Molecular Beam Epitaxy and Concurrent X-ray Diffraction
A novel laser molecular beam epitaxy (LMBE) system for the fabrication of
atomically controlled oxides superlattices and an x-ray diffractometer that
measures spatially-resolved x-ray diffraction spectra have been developed based
on the concept of combinatorial methodology. The LMBE chamber has two moving
masks, an automated target stage, a substrate heating laser, and an in-situ
scanning reflection high-energy electron diffraction system. The x-ray
diffractometer with a curved monochromator and two-dimensional detector is used
for rapid concurrent x-ray diffraction intensity mapping with the two axes of
the detector corresponding to the diffraction angle and a position in the
sample.Comment: 19pages, 9figure
Interaction of massless Dirac field with a Poincar\'e gauge field
In this paper we consider a model of Poincar\'e gauge theory (PGT) in which a
translational gauge field and a Lorentz gauge field are actually identified
with the Einstein's gravitational field and a pair of ``Yang-Mills'' field and
its partner, respectively.In this model we re-derive some special solutions and
take up one of them. The solution represents a ``Yang-Mills'' field without its
partner field and the Reissner-Nordstr\"om type spacetime, which are generated
by a PGT-gauge charge and its mass.It is main purpose of this paper to
investigate the interaction of massless Dirac fields with those fields. As a
result, we find an interesting fact that the left-handed massless Dirac fields
behave in the different manner from the right-handed ones. This can be
explained as to be caused by the direct interaction of Dirac fields with the
``Yang-Mills'' field. Accordingly, the phenomenon can not happen in the
behavior of the neutrino waves in ordinary Reissner-Nordstr\"om geometry. The
difference between left- and right-handed effects is calculated quantitatively,
considering the scattering problems of the massless Dirac fields by our
Reissner-Nordstr\"om type black-hole.Comment: 10pages, RevTeX3.
Partial Structure Factors of Liquid Na-K and Al-Mg Alloys(Physics)
Three partial structure factors S_(Q) have been evaluated from the scattered X-ray intensities of liquid Na-K and Al-Mg alloys assuming that the S_(Q) are independent of the relative abundance of the respective elements in the alloys. The functions S_(Q) and S_(Q) and the reduced radial distribution functions G_(r) and G_(r) obtained in this work are very similar to those observed in the respective pure liquid metals. In both cases, S_(Q) and G_(r) have maxima which lie in between those of the pure elements. From these results, liquid Na-K and Al-Mg alloys are interpreted as random mixing fluids. A comparison between the partial structure factors obtained in this work and those calculated from the hard sphere model was made. Adequate agreement was obtained on the low angle side of the first peak, but agreement on the whole pattern is not necessarily found. The electrical resistivity was calculated using Faber-Ziman\u27s theory and compared with experimental data
The Effect of Titanium on Microstructure and Magnetic Properties of Fe-Cr-Co Hard Magnetic Materials
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