Topic
Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
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TL;DR: In this article, the authors fit the most remarkable experiments in graphene optics by using the Fresnel coefficients, fixing both the surface susceptibility and the surface conductivity of graphene, and showed that the slab model fails to predict absorption and the phase of reflected light.
Abstract: In general the experiments on the linear optical properties of a single-layer two-dimensional atomic crystal are interpreted by modeling it as a homogeneous slab with an effective thickness. Here I fit the most remarkable experiments in graphene optics by using the Fresnel coefficients, fixing both the surface susceptibility and the surface conductivity of graphene. It is shown that the Fresnel coefficients and the slab model are not equivalent. Experiments indicate that the Fresnel coefficients are able to simulate the overall experiments here analyzed, while the slab model fails to predict absorption and the phase of the reflected light.
97 citations
TL;DR: In this paper, the interaction of f- and p-modes with a slab of vertical magnetic field of sunspot strength is simulated numerically in two spatial dimensions, and the energy they extract from the incident f and p modes results in a reduced amplitude for these modes as they exit from the back side of the slab.
Abstract: The interaction of f- and p-modes with a slab of vertical magnetic field of sunspot strength is simulated numerically in two spatial dimensions. Both f-modes and p-modes are partially converted to slow magnetoatmospheric gravity (MAG) waves within the magnetic slab because of the strong gravitational stratification of the plasma along the magnetic lines of force. The slow MAG waves propagate away from the conversion layer guided by the magnetic field lines, and the energy they extract from the incident f- and p-modes results in a reduced amplitude for these modes as they exit from the back side of the slab. In addition, the incident p-modes are partially mixed into f-modes of comparable frequency, and therefore larger spherical harmonic degree, when they exit the magnetic flux concentration. These findings have important implications for the interpretation of observations of p-mode absorption by sunspots, both in terms of the successes and failures of this simple numerical simulation viewed in the sunspot seismology context.
96 citations
TL;DR: In this article, the authors present high-resolution numerical simulations showing that when slow diffusion inhibits the dissolution of pyroxene into garnet, the slab becomes buoyant relative to the ambient mantle and stagnates, whereas when the phase transformations occur in equilibrium, there is no effect on the slab.
Abstract: Oceanic lithosphere sinks, stagnates, and is deflected sub-horizontally beneath western Pacific island arcs, requiring buoyancy in the slab that is inconsistent with a thermal origin. The transformation of pyroxene to majoritic garnet occurs by extremely slow diffusion, and pyroxene is therefore unlikely to transform at equilibrium pressures and temperatures in the cold interior of slabs. We present high-resolution numerical simulations showing that when slow diffusion inhibits the dissolution of pyroxene into garnet, the slab becomes buoyant relative to the ambient mantle and stagnates, whereas when the phase transformations occur in equilibrium, there is no effect on the slab. We test the model by comparing slab temperature and geometry and find that sub-horizontal slabs are more likely colder than average, consistent with our numerical simulations.
96 citations
TL;DR: In this paper, a tomographic image of the upper mantle was generated between 60 km and 500 km depth from 80 earthquakes recorded at 75 temporary and 79 permanent stations during 2005 and 2006.
96 citations
TL;DR: The combination of B-isotope systematics and Cs concentrations in lavas from the Halmahera arc (Indonesia) suggests that they have been influenced by fluids derived from dehydration and/or melting of the subducted slab as discussed by the authors.
Abstract: Dehydration of sediments and oceanic crust within the subducting slab at convergent plate margins is probably a ubiquitous feature. This leads to fractionation of elements between fluids and solids so that the slab-derived component of island-arc lavas is modified from the originally subducted material. Sediments and altered oceanic crust are enriched in boron and cesium relative to uncontaminated mantle products, and these elements are highly mobile during fluid-rock interaction. The combination of B-isotope systematics and Cs concentrations in lavas from the Halmahera arc (Indonesia) suggests that they have been influenced by fluids derived from dehydration and/or melting of the subducted slab.
96 citations