97,305 research outputs found
Influence of interface structure on electronic properties and Schottky barriers in Fe/GaAs magnetic junctions
The electronic and magnetic properties of Fe/GaAs(001) magnetic junctions are
investigated using first-principles density-functional calculations. Abrupt and
intermixed interfaces are considered, and the dependence of charge transfer,
magnetization profiles, Schottky barrier heights, and spin polarization of
densities of states on interface structure is studied. With As-termination, an
abrupt interface with Fe is favored, while Ga-terminated GaAs favors the
formation of an intermixed layer with Fe. The Schottky barrier heights are
particularly sensitive to the abruptness of the interface. A significant
density of states in the semiconducting gap arises from metal interface states.
These spin-dependent interface states lead to a significant minority spin
polarization of the density of states at the Fermi level that persists well
into the semiconductor, providing a channel for the tunneling of minority spins
through the Schottky barrier. These interface-induced gap states and their
dependence on atomic structure at the interface are discussed in connection
with potential spin-injection applications.Comment: 9 pages, 9 figures, to appear in PR
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'BioNessie(G) - a grid enabled biochemical networks simulation environment
The simulation of biochemical networks provides insight and
understanding about the underlying biochemical processes and pathways
used by cells and organisms. BioNessie is a biochemical network simulator
which has been developed at the University of Glasgow. This paper
describes the simulator and focuses in particular on how it has been
extended to benefit from a wide variety of high performance compute resources
across the UK through Grid technologies to support larger scale
simulations
BioNessie - a grid enabled biochemical networks simulation environment
The simulation of biochemical networks provides insight and understanding about the underlying biochemical processes and pathways used by cells and organisms. BioNessie is a biochemical network simulator which has been developed at the University of Glasgow. This paper describes the simulator and focuses in particular on how it has been extended to benefit from a wide variety of high performance compute resources across the UK through Grid technologies to support larger scale simulations
A Quasi-Spherical Gravitational Wave Solution in Kaluza-Klein Theory
An exact solution of the source-free Kaluza-Klein field equations is
presented. It is a 5D generalization of the Robinson-Trautman quasi-spherical
gravitational wave with a cosmological constant. The properties of the 5D
solution are briefly described.Comment: 10 pages Latex, Revtex, submitted to GR
Results in Kalb-Ramond field localization and resonances on deformed branes
We make an analysis about several aspects of localization of the Kalb-Ramond
gauge field in a specific four dimensional AdS membrane embedded in a five
dimensional space-time. The membrane is generated from a deformation of the
potential and belongs to a new class of defect solutions. In
this context we find resonance structures in the analysis of massive modes. The
study of deformed defects is important because they contain internal structures
and these may have implications to the way the background space-time is
constructed and the way its curvature behaves. The main objective here is to
observe the contributions of the deformation procedure to the resonances and
the well known field localization methods.Comment: 6 pages, 7 figures, Latex with EPL macr
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