888,042 research outputs found
The Schwarzschild-Black String AdS Soliton: Instability and Holographic Heat Transport
We present a calculation of two-point correlation functions of the
stress-energy tensor in the strongly-coupled, confining gauge theory which is
holographically dual to the AdS soliton geometry. The fact that the AdS soliton
smoothly caps off at a certain point along the holographic direction, ensures
that these correlators are dominated by quasinormal mode contributions and thus
show an exponential decay in position space. In order to study such a field
theory on a curved spacetime, we foliate the six-dimensional AdS soliton with a
Schwarzschild black hole. Via gauge/gravity duality, this new geometry
describes a confining field theory with supersymmetry breaking boundary
conditions on a non-dynamical Schwarzschild black hole background. We also
calculate stress-energy correlators for this setting, thus demonstrating
exponentially damped heat transport. This analysis is valid in the confined
phase. We model a deconfinement transition by explicitly demonstrating a
classical instability of Gregory-Laflamme-type of this bulk spacetime.Comment: 26 pages, 3 figure
Thermal spin transport and spin-orbit interaction in ferromagnetic/non-magnetic metals
In this article we extend the currently established diffusion theory of
spin-dependent electrical conduction by including spin-dependent
thermoelectricity and thermal transport. Using this theory, we propose new
experiments aimed at demonstrating novel effects such as the spin-Peltier
effect, the reciprocal of the recently demonstrated thermally driven spin
injection, as well as the magnetic heat valve. We use finite-element methods to
model specific devices in literature to demonstrate our theory. Spin-orbit
effects such as anomalous-Hall, -Nernst, anisotropic magnetoresistance and
spin-Hall are also included in this model
Femtosecond transition-state dynamics
This article presents the progress made in probing femtosecond transition–state dynamics of elementary reactions. Experiments demonstrating the dynamics in systems characterized by a transition region and by a saddle-point transition state are reported, and comparison with theory is made
Observation of magnetic circular dichroism in Fe L_{2,3} x-ray-fluorescence spectra
We report experiments demonstrating circular dichroism in the x-ray-fluorescence spectra of magnetic systems, as predicted by a recent theory. The data, on the L_{2,3} edges of ferromagnetic iron, are compared with fully relativistic local spin density functional calculations, and the relationship between the dichroic spectra and the spin-resolved local density of occupied states is discussed
- …